Omar

In 610 Muhammad started preaching the message of Islam. However, like many others in Mecca, Omar opposed Islam and even threatened to kill Muhammad. He resolved to defend the traditional polytheistic religion of Arabia. He was adamant and cruel in opposing Muhammad, and very prominent in persecuting Muslims.[22] He recommended Muhammad's death.[23] He firmly believed in the unity of the Quraish and saw the new faith of Islam as a cause of division and discord.[22]

Due to persecution, Muhammad ordered some of his followers to migrate to Abyssinia. When a small group of Muslims migrated, Omar became worried about the future unity of the Quraish and decided to have Muhammad assassinated.[24]

Omar converted to Islam in 616, one year after the Migration to Abyssinia. The story was recounted in Ibn Ishaq's Sīrah. On his way to murder Muhammad, Omar met his best friend Nua'im bin Abdullah who had secretly converted to Islam but had not told Omar. When Omar informed him that he had set out to kill Muhammad, Nua'im said, “By God, you have deceived yourself, O Omar! Do you think that Banu Abd Manaf would let you run around alive once you had killed their son Muhammad? Why don't you return to your own house and at least set it straight?"[25]

Nuaimal Hakim told him to inquire about his own house where his sister and her husband had converted to Islam. Upon arriving at her house, Omar found his sister and brother-in-law Saeed bin Zaid (Omar's cousin) reciting the verses of the Quran from sura Ta-Ha.[26] He started quarreling with his brother-in-law. When his sister came to rescue her husband, he also started quarreling with her. Yet still they kept on saying "you may kill us but we will not give up Islam". Upon hearing these words, Omar slapped his sister so hard that she fell to the ground bleeding from her mouth. When he saw what he did to his sister, he calmed down out of guilt and asked his sister to give him what she was reciting. His sister replied in the negative and said "You are unclean, and no unclean person can touch the Scripture." He insisted, but his sister was not prepared to allow him to touch the pages unless he washed his body. Omar at last gave in. He washed his body and then began to read the verses that were: Verily, I am Allah: there is no God but Me; so serve Me (only), and establish regular prayer for My remembrance (Quran 20:14). He wept and declared, "Surely this is the word of Allah. I bear witness that Muhammad is the Messenger of Allah." On hearing this, Khabbab came out from inside and said: "O, Omar! Glad tidings for you. Yesterday Muhammad prayed to Allah, 'O, Allah! Strengthen Islam with either Omar or Abu Jahl, whomsoever Thou likest.' It seems that his prayer has been answered in your favour."[27]

Omar then went to Muhammad with the same sword he intended to kill him with and accepted Islam in front of him and his companions. Omar was 39 years old when he accepted Islam.[28]

Following his conversion, Omar went to inform the chief of Quraish, Amr ibn Hishām, about his acceptance of Islam. According to one account, Omar thereafter openly prayed at the Kaaba as the Quraish chiefs, Amr ibn Hishām and Abu Sufyan ibn Harb, reportedly watched in anger.[29] This further helped the Muslims to gain confidence in practicing Islam openly. At this stage Omar even challenged anyone who dared to stop the Muslims from praying, although no one dared to interfere with Omar when he was openly praying.

Omar's conversion to Islam granted power to the Muslims and to the Islamic faith in Mecca. It was after this event that Muslims offered prayers openly in Masjid al-Haram for the first time. Abdullah bin Masoud said,

Umar's embracing Islam was our victory, his migration to Medina was our success, and his reign a blessing from Allah. We didn't offer prayers in Al-Haram Mosque until Umar had accepted Islam. When he accepted Islam, the Quraysh were compelled to let us pray in the Mosque.[30]

In 622 CE, due to the safety offered by Yathrib (later renamed Medīnat an-Nabī, or simply Medina), Muhammad ordered his followers to migrate to Medina. Most Muslims migrated at night fearing Quraish resistance, but Omar is reported to have left openly during the day saying: "Any one who wants to make his wife a widow and his children orphans should come and meet me there behind that cliff."[31][32] Omar migrated to Medina accompanied by his cousin and brother-in-law Saeed ibn Zaid.[28]

Sword of Omar

When Muhammad arrived in Medina, he paired each immigrant (Muhajir) with one of the residents of the city (Ansari), joining Muhammad ibn Maslamah with Omar, making them brothers in faith. Later in Omar's reign as caliph, Muhammad ibn Muslamah would be assigned the office of Chief Inspector of Accountability. Muslims remained in peace in Medina for approximately a year before the Quraish raised an army to attack them. In 624 Omar participated in the first battle between Muslims and Quraish of Mecca i.e., the Battle of Badr. In 625 he took part in the Battle of Uhud. In the second phase of the battle, when Khalid ibn Walid's cavalry attacked the Muslim rear, turning the tide of battle, rumours of Muhammad's death were spread and many Muslim warriors were routed from the battlefield, Omar among them. However, hearing that Muhammad was still alive, he went to Muhammad at the mountain of Uhud and prepared for the defence of the hill.[33] Later in the year Omar was a part of a campaign against the Jewish tribe of Banu Nadir. In 625 Omar's daughter Hafsah was married to Muhammad.[34] Later in 627 he participated in the Battle of the Trench and also in the Battle of Banu Qurayza.[35] In 628 Omar witnessed the Treaty of Hudaybiyyah.[35] In 628 he fought in the Battle of Khaybar. In 629 Muhammad sent Amr ibn al-A’as to Zaat-ul-Sallasal, after which, Muhammad sent Abu Ubaidah ibn al-Jarrah with reinforcements, including Abu Bakr and Omar, whereupon they attacked and defeated the enemy.[36] In 630, when Muslim armies rushed for the conquest of Mecca, he was part of that army. Later in 630, he fought in the Battle of Hunayn and the Siege of Ta'if. He was part of the Muslim army that contested the Battle of Tabouk under Muhammad's command and he was reported to have given half of his wealth for the preparation of this expedition. He also participated in the farewell Hajj of Muhammad in 632.[37]

When Muhammad died on 8 June 632 Omar initially disbelieved that he was dead.[38] It is said that Omar promised to strike the head of any man who would say that Muhammad died. Omar said: "He has not died but rather he has gone to his lord just as Moses went, remaining absent from his people for forty nights after which he has returned to them. By Allah, the messenger of Allah will indeed return just as Moses returned (to his people) and he will cut off the hands and legs of those men who claimed he has died."[39] Abu Bakr then publicly spoke to the community in the mosque, saying:

"Whoever worshiped Muhammad, let them know that Muhammad has died, and whoever worshiped Allah, let them know that Allah is alive and never dies."

[40] Abū Bakr then recited these verses from the Qur'an:

"Muhammad is but a messenger; messengers (the like of whom) have passed away before him. If, then, he dies or is killed, will you turn back on your heel?"

[40] Hearing this, Omar fell on his knees in sorrow and acceptance. Sunni Muslims say that this denial of Muhammad's death was occasioned by his deep love for him.[38]

Abu Bakr appointed Omar as his successor before dying in 634 CE.[52] Due to his strict and autocratic nature, Omar was not a very popular figure among the notables of Medina and members of Majlis al Shura; accordingly, high-ranking companions of Abu Bakr attempted to discourage him from naming Omar.[53][54] Nevertheless, Abu Bakr decided to make Omar his successor. Omar was well known for his extraordinary willpower, intelligence, political astuteness, impartiality, justice, and care for the poor.[55] Abu Bakr is reported to have said to the high-ranking advisers:

His (Omar's) strictness was there because of my softness when the weight of Caliphate will be over his shoulders he will remain no longer strict. If I will be asked by God to whom I have appointed my successor, I will tell him that I have appointed the best man among your men.[56]

Abu Bakr was aware of Omar's power and ability to succeed him. His was perhaps one of the smoothest transitions of power from one authority to another in the Muslim lands.[57] Before his death, Abu Bakr called Uthman to write his will in which he declared Omar his successor. In his will he instructed Omar to continue the conquests on Iraqi and Syrian fronts.

Even though almost all of the Muslims had given their pledge of loyalty to Omar, he was feared more than loved. According to Muhammad Husayn Haykal, the first challenge for Omar was to win over his subjects and the members of Majlis al Shura.[58]

Omar was a gifted orator, and he used his ability to improve his reputation among the people.[59]

Muhammad Husayn Haykal wrote that Omar's stress was on the well-being of the poor and underprivileged.[60] In addition to this, Omar, in order to improve his reputation and relation with the Banu Hashim, the tribe of Ali, delivered to the latter his disputed estates in Khayber. He followed Abu Bakr's decision over the disputed land of Fidak, continuing to treat it as state property. In the Ridda wars, thousands of prisoners from rebel and apostate tribes were taken away as slaves during the expeditions. Omar ordered a general amnesty for the prisoners, and their immediate emancipation.[61] This made Omar quite popular among the Bedouin tribes. With the necessary public support on his side, Omar took the bold decision of recalling Khalid ibn Walid from supreme command on the Roman front.[62]

The government of Omar was a unitary government, where the sovereign political authority was the caliph. The empire of Omar was divided into provinces and some autonomous territories, e.g., Azerbaijan and Armenia, that had accepted the suzerainty of the caliphate. The provinces were administered by the provincial governors or Wali, personally and fastidiously selected by Omar. Provinces were further divided into about 100 districts. Each district or main city was under the charge of a junior governor or Amir, usually appointed by Omar himself, but occasionally also appointed by the provincial governor. Other officers at the provincial level were:

1. Katib, the Chief Secretary.
2. Katib-ud-Diwan, the Military Secretary.
3. Sahib-ul-Kharaj, the Revenue Collector.
4. Sahib-ul-Ahdath, the Police chief.
5. Sahib-Bait-ul-Mal, the Treasury Officer.
6. Qadi, the Chief Judge.

In some districts there were separate military officers, though the Wali was, in most cases, the Commander-in-chief of the army quartered in the province.

Every appointment was made in writing. At the time of appointment an instrument of instructions was issued with a view to regulating the Wali's conduct. On assuming office, the Wali was required to assemble the people in the main mosque, and read the instrument of instructions before them.[63]

Omar's general instructions to his officers were:

Remember, I have not appointed you as commanders and tyrants over the people. I have sent you as leaders instead, so that the people may follow your example. Give the Muslims their rights and do not beat them lest they become abused. Do not praise them unduly, lest they fall into the error of conceit. Do not keep your doors shut in their faces, lest the more powerful of them eat up the weaker ones. And do not behave as if you were superior to them, for that is tyranny over them.

Various other strict codes of conduct were to be obeyed by the governors and state officials. The principal officers were required to travel to Mecca on the occasion of the Hajj, during which people were free to present any complaint against them. In order to minimize the chances of corruption, Omar made it a point to pay high salaries to the staff. Provincial governors received as much as five to seven thousand dirham annually besides their shares of the spoils of war (if they were also the commander in chief of the army of their sector). Under Omar the empire was divided into the following provinces:

1. Mecca (Arabia)
2. Medina (Arabia)
3. Basra (Iraq)
4. Kufa (Iraq)
5. Jazira, in the upper reaches of the Tigris and Euphrates
6. Syria
7. Iliyā' (إلياء) (Palestine)
8. Ramlah (Palestine)
9. Upper Egypt
10. Lower Egypt
11. Khorasan (Persia)
12. Azerbaijan (Persia)
13. Fars (Persia)

Omar was first to establish a special department for the investigation of complaints against the officers of the State. This department acted as the Administrative court, where the legal proceedings were personally led by Omar.[64] The Department was under the charge of Muhammad ibn Maslamah, one of Omar's most trusted men. In important cases Muhammad ibn Maslamah was deputed by Omar to proceed to the spot, investigate the charge and take action. Sometimes an Inquiry Commission was constituted to investigate the charge. On occasion, the officers against whom complaints were received were summoned to Medina, and charged in Omar's administrative court. Omar was known for this intelligence service through which he made his officials accountable.[65] This service was also said to have inspired fear in his subjects.[66]

Omar was a pioneer in some affairs:

1. Omar was the first to introduce the public ministry system, where the records of officials and soldiers were kept. He also kept a record system for messages he sent to Governors and heads of state.
2. He was the first to appoint police forces to keep civil order.
3. He was the first to discipline the people when they became disordered.[67]

Another important aspect of Omar's rule was that he forbade any of his governors and agents from engaging in any sort of business dealings whilst in a position of power. An agent of Omar by the name of Al Harith ibn K'ab ibn Wahb was once found to have extra money beyond his salary and Omar enquired about his wealth. Al Harith replied that he had some money and he engaged in trade with it. Omar said: By Allah, we did not send you to engage in trade! and he took from him the profits he had made.[68]

Since Medina, with a rapidly growing population, was at risk of recurring famines when crops were lacking, Omar sought to facilitate the import of grain. He ordered the building of a canal connecting the Nile to the Red Sea and an improvement of port infrastructure on the Arabian coast. When Basra was established during Omar's rule, he started building a nine-mile canal from the Tigris to the new city for irrigation and drinking water.[69] Al-Tabari reports that 'Utba ibn Ghazwan built the first canal from the Tigris River to the site of Basra when the city was in the planning stage. After the city was built, Omar appointed Abu Musa Ashaari (17-29/638 – 650) as its first governor. He began building two important canals, the al-Ubulla and the Ma'qil, linking Basra with the Tigris River. These two canals were the basis for the agricultural development for the whole Basra region and used for drinking water. Omar also adopted a policy of assigning barren lands to those who undertook to cultivate them. This policy continued during the Umayyad period and resulted in the cultivation of large areas of barren lands through the construction of irrigation canals by the state and by individuals.[70]

Under Omar's leadership, the empire expanded; accordingly, he began to build a political structure that would hold together the vast territory. He undertook many administrative reforms and closely oversaw public policy, establishing an advanced administration for the newly conquered lands, including several new ministries and bureaucracies, and ordered a census of all the Muslim territories. During his rule, the garrison cities (amsar) of Basra and Kufa were founded or expanded. In 638, he extended and renovated the Masjid al-Haram (Grand Mosque) in Mecca and Al-Masjid al-Nabawi (Mosque of the Prophet) in Medina.[71]

Omar also ordered the expulsion to Syria and Iraq of the Christian and Jewish communities of Najran and Khaybar. He also permitted Jewish families to resettle in Jerusalem, which had previously been barred from all Jews.[72] He issued orders that these Christians and Jews should be treated well and allotted them the equivalent amount of land in their new settlements. Omar also forbade non-Muslims from residing in the Hejaz for longer than three days.[73] He was first to establish the army as a state department.

Omar was founder of Fiqh, or Islamic jurisprudence.[74] He is regarded by Sunni Muslims as one of the greatest Faqih, and, as such, he started the process of codifying Islamic Law.

In 641, he established Bayt al-mal, a financial institution and started annual allowances for the Muslims. As a leader, 'Omar was known for his simple, austere lifestyle. Rather than adopt the pomp and display affected by the rulers of the time, he continued to live much as he had when Muslims were poor and persecuted. In 638, his fourth year as caliph and the seventeenth year since the Hijra, he decreed that the Islamic calendar should be counted from the year of the Hijra of Muhammad from Mecca to Medina.

Omar's visit to Jerusalem is documented in several sources. A recently discovered Judeo-Arabic text has disclosed the following anecdote:[72]

"Omar ordered Gentiles and a group of Jews to sweep the area of the Temple Mount. Omar oversaw the work. The Jews who had come sent letters to the rest of the Jews in Palestine and informed them that Omar had permitted resettlement of Jerusalem by Jews. Omar, after some consultation, permitted seventy Jewish households to return. They returned to live in the southern part of the city, i.e., the Market of the Jews. (Their aim was to be near the water of Silwan and the Temple Mount and its gates). Then the Commander Omar granted them this request. The seventy families moved to Jerusalem from Tiberias and the area around it with their wives and children."

It is also reported in the name of the Alexandrian Bishop Eutychius (932–940 CE) that the rock known as the Temple Mount had been a place of ruins as far back as the time of the Empress Helena, mother of Constantine the Great, who built churches in Jerusalem. "The Byzantines," he said, "had deliberately left the ancient site of the Temple as it was, and had even thrown rubbish on it, so that a great heap of rubble formed." It was only when Omar marched into Jerusalem with an army that he asked Kaab, who was Jewish before he converted to Islam, "Where do you advise me to build a place of worship?" Kaab indicated the Temple Rock, now a gigantic heap of ruins from the temple of Jupiter.[75] The Jews, Kaab explained, had briefly won back their old capital a quarter of a century before (when Persians overran Syria and Palestine), but they had not had time to clear the site of the Temple, for the Rums (Byzantines) had recaptured the city. It was then that Omar ordered the rubbish on the Ṣakhra (rock) to be removed by the Nabataeans, and after three showers of heavy rain had cleansed the Rock, he instituted prayers there. To this day, the place is known as ḳubbat es ṣakhra, the Dome of the Rock.

According to lexicographer David ben Abraham al-Fasi (died before 1026 CE), the Muslim conquest of Palestine brought relief to the country's Jewish citizens, who had previously been barred by the Byzantines from praying on the Temple Mount.[76]

The military conquests were partially terminated between 638 and 639 during the years of great famine in Arabia and plague in the Levant. During his reign the Levant, Egypt, Cyrenaica, Tripolitania, Fezzan, Eastern Anatolia, almost the whole of the Sassanid Persian Empire including Bactria, Persia, Azerbaijan, Armenia, Caucasus and Makran were annexed to the Rashidun Caliphate. According to one estimate more than 4,050 cities were captured during these military conquests.[77] Prior to his death in 644, Omar had ceased all military expeditions apparently to consolidate his rule in recently conquered Roman Egypt and the newly conquered Sassanid Empire (642–644). At his death in November 644, his rule extended from present day Libya in the west to the Indus river in the east and the Oxus river in the north.

In 638 CE, Arabia fell into severe drought followed by a famine. Soon after, the reserves of food at Medina began to run out. Omar ordered caravans of supplies from Syria and Iraq, and personally supervised their distribution. His actions saved countless lives throughout Arabia.[78] The first governor to respond was Abu Ubaidah ibn al-Jarrah, the governor of Syria and supreme commander of the Rashidun army.

Later, Abu Ubaidah paid a personal visit to Medina and acted as an officer of disaster management, which was headed personally by Omar. For internally displaced people, Omar hosted a dinner every night at Medina, which according to one estimate, had attendance of more than a hundred thousand people.[79]

While famine was ending in Arabia, many districts in Syria and Palestine were devastated by plague. While Omar was on his way to visit Syria, at Elat, he was received by Abu Ubaidah ibn al-Jarrah, governor of Syria, who informed him about the plague and its intensity, and suggested that Omar go back to Medina. Omar tried to persuade Abu Ubaidah to come with him to Medina, but he declined to leave his troops in that critical situation. Abu Ubaidah died in 639 of the plague, which also cost the lives of 25,000 Muslims in Syria. After the plague had weakened, in late 639, Omar visited Syria for political and administrative re-organization, as most of the veteran commanders and governors had died of the plague.[80]

To be close to the poor, Omar lived in a simple mud hut without doors and walked the streets every evening. After consulting with the poor, Omar established the first welfare state, Bayt al-mal.[81][82][83] The Bayt al-mal aided the Muslim and non-Muslim poor, needy, elderly, orphans, widows, and the disabled. The Bayt al-mal ran for hundreds of years, from the Rashidun Caliphate in the 7th century through the Umayyad period (661–750) and well into the Abbasid era. Omar also introduced a child benefit and pensions for the children and the elderly.[84][85][86][87]

Local populations of Jews and Christians, persecuted as religious minorities and taxed heavily to finance the Byzantine–Sassanid Wars, often aided Muslims to take over their lands from the Byzantines and Persians, resulting in exceptionally speedy conquests.[88][89] As new areas were attached to the Caliphate, they also benefited from free trade, while trading with other areas in the Caliphate (to encourage commerce, in Islam trade is not taxed, but wealth is subject to the zakat).[90] Since the so-called Constitution of Medina, drafted by Muhammad, the Jews and the Christians continued to use their own laws in the Caliphate and had their own judges.[91][92][93]

On his deathbed, Omar vacillated on his succession. However, it has been reported that he said that if Abu Ubaidah ibn al-Jarrah, Khalid ibn Walid or Salim, the mawla and freed Persian slave, were alive he would have appointed one of them his successor. Omar finally appointed a committee of six persons to choose a caliph from amongst them: Abdur Rahman bin Awf, Saad ibn Abi Waqqas, Talha ibn Ubaidullah, Uthman ibn Affan, Ali ibn Abi Talib and Zubayr ibn al-Awwam.[99]

All six are among the ten people promised paradise according to Sunnis.[100] The only one out of the 'famous ten' left out of the committee who was still alive at the time was Saeed ibn Zaid, the cousin and brother-in-law of Omar. He was excluded on the basis of being related by blood and of the same tribe as Omar. Omar had a policy of not appointing anyone related to him to a position of authority even if they were qualified by his standards.[101]

Omar appointed a band of fifty armed soldiers to protect the house where the meeting was proceeding. Until the appointment of the next caliph, Omar appointed a notable Sahabi and mawla, Suhayb ar-Rumi (Suhayb the Roman), as a caretaker caliph. While the meeting for selection of a caliph was proceeding, Abdulrehman ibn Abu Bakr and Abdur Rahman bin Awf revealed that they saw the dagger used by Piruz, the assassin of Omar. A night before Omar's assassination, reported Abdur Rahman bin Awf, he saw Hurmuzan, Jafina and Abu Lulu, while they were suspiciously discussing something. Surprised by his presence, the dagger fell; it was the same two-sided dagger used in the assassination. Abdulrehman ibn Abu Bakr, son of the late caliph Abu Bakr, confirmed that, a few days before Omar's assassination, he saw this dagger in Hurmuzan's possession. After this revelation, it seemed clear that it had been planned by the Persians residing in Medina. Infuriated by this, Omar's younger son Ubaidullah ibn Umar sought to kill all the Persians in Medina. He killed Hurmuzan, Jafinah, and the daughter of Omar's assassin Abu Lulu, who is believed to have been a Muslim. Ubaidullah was intercepted by the people of Medina, who prevented him from continuing the massacre. Amr ibn al-Aas is said to have intercepted him and convinced him to hand over his sword. The murder of Jafinah enraged Saad ibn Abi Waqqas, his foster brother, and he assaulted Ubaidullah ibn Umar; again the companions intervened. When Omar was informed about the incident, he ordered Ubaidullah imprisoned, and that the next caliph should decide his fate.[97]

Omar died on 3 November 644; on 7 November Uthman succeeded him as caliph. After prolonged negotiations, the tribunal decided to give blood money to the victims, and released Omar's son Ubaidullah on the ground that, after the tragedy of Omar's assassination, people would be further infuriated by the execution of his son the very next day.

One writer states that Omar was a political genius and, as an architect of the Islamic Empire, rates him as the 52nd most influential figure in history.[106] Omar was one of Muhammad's chief advisers. After Muhammad's passing, it was Omar who reconciled the Medinan Muslims to accept Abu Bakr, a Meccan, as the caliph.[107] During Abu Bakr's era, he actively participated as his secretary and main adviser.[108] After succeeding Abu Bakr as caliph, Omar won over the hearts of Bedouin tribes by emancipating all their prisoners and slaves taken during the Ridda wars.[109]

He built up an efficient administrative structure that held together his vast realm. He organized an effective intelligence network, one of the reasons for his strong grip on his bureaucracy.[110]

Omar never appointed governors for more than two years, for they might amass too much local power. He dismissed his most successful general, Khalid ibn Walid, because he wanted people to know that it is Allah who grants victory, and to counter the cult of personality that had built up around Khalid, for the sake of the Muslim faith.[111]

He would patrol the streets of Medina with a whip in his hand, ready to punish any offenders he might come across. It is said that Omar's whip was feared more than the sword of another man. But with all of this, he was also known for being kindhearted, answering the needs of the fatherless and widows.[112]

Omar's swift imposition of justice against his governors for misdeeds made even powerful governors such as Muawiyah scared of him. Ali ibn Abu Talib, during the later rule of Uthman ibn Affan, wanted Uthman to be more strict with his governors, saying, "I adjure you by God, do you know that Mu'awiyah was more afraid of Omar than was Omar's own servant Yarfa?"[113]

Under Omar's rule, in order to promote strict discipline, Arab soldiers were settled outside of cities, between the desert and cultivated lands in special garrison towns known as "amsar". Known examples of such settlements are Basra and Kufa, in Iraq, and Fustat south of what would later become Cairo. His soldiers were forbidden to own land outside of Arabia. There were restrictions on their right to seize buildings and other immovable things usually thought of as prizes of war. Movable spoils were shared with the people of the umma, regardless of their social stratum.[114]

A modern researcher writes about this:[115]

He used to monitor public policy very closely, and had kept the needs of the public central to his leadership approach. As second caliph of Islam, he refused to chop off the hands of thieves because he felt he had fallen short of his responsibility to provide meaningful employment to all his subjects. As a ruler of a vast kingdom, his vision was to ensure that every one in his kingdom should sleep on a full stomach.

If a dog dies hungry on the banks of the River Euphrates, Omar will be responsible for dereliction of duty.

— (Omar)

He also knew that just having a vision is not enough unless it is supported by effective strategies. He didn't only have a vision; he truly transformed his vision into actions. For example, to ensure that nobody sleeps hungry in his empire, he used to walk through the streets almost every night to see if there is any one needy or ill.

In The Decline and Fall of the Roman Empire, Gibbon refers to Omar in the following terms:

"Yet the abstinence and humility of Omar were not inferior to the virtues of Abubeker; his food consisted of barley bread or dates; his drink was water; he preached in a gown that was torn or tattered in twelve places; and a Persian satrap who paid his homage to the conqueror, found him asleep among the beggars on the steps of the mosque of Medina."[116]

His rule was one of the few moments in the history of Islam where Muslims were united as a single community. Abdullah ibn Masʿud would often weep whenever the subject of Omar was brought up. He said: "Umar was a fortress of Islam. People would enter Islam and not leave. When he died, the fortress was breached and now people are going out of Islam".[117] Abu Ubaidah ibn al-Jarrah before Omar died famously said: "If Omar dies, Islam would be weakened". People asked him why and his reply was "You will see what I am speaking about if you survive."[117] His greatest achievement from a religious perspective was the compilation of the Qur'an.[118] This had not been done during the time of Muhammad. However, during the Battle of Yamama a great number of the memorizers of the Quran perished in the battle. On the advice of Omar, Abu Bakr tasked Zayd ibn Thabit with the momentous task of compiling the Quran into a single Book.[51]

Along with Khalid ibn Walid, Omar was influential in the Ridda wars.[119]

One strategic success was his sundering of the Byzantine-Sassanid alliance in 636, when Emperor Heraclius and Emperor Yazdegerd III allied against their common enemy. He was lucky in that the Persian Emperor Yazdegerd III couldn't synchronize with Heraclius as planned. Omar fully availed himself of the opportunity by inducing the Byzantines to act prematurely. This was contrary to the orders of Emperor Heraclius, who presumably wanted a coordinated attack along with the Persians. Omar did this by sending reinforcements to the Roman front in the Battle of Yarmouk, with instructions that they should appear in the form of small bands, one after the other, giving the impression of a continuous stream of reinforcements that finally lured the Byzantines to an untimely battle. On the other hand, Yazdegerd III was engaged in negotiations that further gave Omar time to transfer his troops from Syria to Iraq. These troops proved decisive in the Battle of Qadisiyyah.

His strategy resulted in a Muslim victory at the Second Battle of Emesa in 638, where the pro-Byzantine Christian Arabs of Jazira, aided by the Byzantine Emperor, made an unexpected flanking movement and laid siege to Emesa (Homs).

Omar issued an order to invade the very homeland of the Christian Arab forces besieging Emesa, the Jazirah. A three-pronged attack against Jazirah was launched from Iraq. To further pressure the Christian Arab armies, Omar instructed Saad ibn Abi Waqqas, commander of Muslim forces in Iraq, to send reinforcements to Emesa. Omar himself led reinforcements there from Medina. Under this unprecedented pressure, the Christian Arabs retreated from Emesa before Muslim reinforcements could arrive. The Muslims annexed Mesopotamia and parts of Byzantine Armenia.

After the Battle of Nahavand, Omar launched a full-scale invasion of the Sassanid Persian Empire. The invasion was a series of well-coordinated multi-pronged attacks designed to isolate and destroy their targets. Omar launched the invasion by attacking the very heart of Persia, aiming to isolate Azerbaijan and eastern Persia. This was immediately followed by simultaneous attacks on Azerbaijan and Fars. Next, Sistan and Kirman were captured, thus isolating the stronghold of Persia, the Khurasan. The final expedition was launched against Khurasan, where, after the Battle of Oxus River, the Persian empire ceased to exist, and Yazdegerd III fled to Central Asia.

Omar is remembered by Sunnis as a rigid Muslim of a sound and just disposition in matters of religion; a man they title Farooq, meaning "leader, jurist and statesman", and the second of the rightly guided caliphs. He patched his clothes with skin, took buckets on his two shoulders, always riding his donkey without the saddle, rarely laughing and never joking with anyone. On his ring is written the words "Enough is Death as a reminder to you O' 'Omar".[120] He did not seek advancement for his own family, but rather sought to advance the interests of the Muslim community, the ummah. According to one of Muhammad's companions, Abd Allah ibn Mas'ud:

Umar's submission to Islam was a conquest, his migration was a victory, his Imamate (period of rule) was a blessing, I have seen when we were unable to pray at the Kaabah until Umar submitted, when he submitted to Islam, he fought them (the pagans) until they left us alone and we prayed.

— Abd Allah ibn Mas'ud, [121]

Omar is viewed very negatively in the literature of Twelver Shi'a (the main branch of Shia Islam[122][123]) and is often regarded as a usurper of Ali's right to the Caliphate. After the Saqifah assembly chose Abu Bakr as caliph, Omar marched with armed men to Ali's house in order to get the allegiance of Ali and his supporters. Sources indicate that a threat was made to burn Ali's house if he refused, but the encounter ended when Fatimah, wife of Ali, intervened.[124] According to the majority of Twelver scholar writings, Fatimah was physically assaulted by Omar, that this caused her to miscarry her child, Muhsin ibn Ali, and led to her death soon after.[125] (see Umar at Fatimah's house). However, some Twelver scholars, such as Fadhlalla, reject these accounts of physical abuse as a "myth",[126] although Fadlallah mentioned that his speech is a probability, and not a certain reason to reject that event.[127][128]

Another Shia sect, the Zaidiyyah followers of Zaid ibn Ali, generally has two views about that. Some branches, such as Jaroudiah (Sarhubiyya), don't accept Omar and Abu Bakr as legitimate caliphs. For instance, Jarudiyya believes that Muhammad appointed Ali and believes that the denial of the Imamate of Ali after Muhammad's passing would lead to infidelity and deviation from the right path.[129] The other view accepts Omar and Abu Bakr as legitimate caliphs, albeit inferior to Ali.[130] According to al-Tabari (and Ibn A'tham),[131] when asked about Abu Bakr and Omar, Zayd ibn Ali replied: "I have not heard anyone in my family renouncing them both nor saying anything but good about them...when they were entrusted with government they behaved justly with the people and acted according to the Qur'an and the Sunnah.".[132][133]