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Shiavault - a Vault of Shia Islamic Books A Restatement of the History of Islam and Muslims Umar's Conversion to Islam Umar's Conversion to Islam - A.D. 616 The most notable event of the year 6 of the Proclamation was the conversion to Islam of Umar bin al-Khattab, a future khalifa of the Muslims. He was one of the most rabid enemies of Islam and of Muhammad, the Messenger of God, and was a great tormentor of the Muslims.
The modern Egyptian historian, Amin Dawidar, says that Umar's hatred of Islam, and his hostility to Muhammad, were matched only by the hatred of, and hostility to them, of his own maternal uncle, Abu Jahl. It is said that one day in sheer exasperation, Umar resolved to kill Muhammad, and thus to extinguish the flame of Islam itself. He left his home with this intention.
As already noted, the Muslims at this time (the last days of the year 6) still gathered in the house of Arqam bin Abi al-Arqam to say their congregational prayers. They were beginning to assemble when one of them, looking out the window, saw Umar approaching toward the house with a drawn sword. In a state of considerable alarm, he told the other members of the congregation what he saw. Presumably, they too were alarmed.
But Hamza, who was also present in the house of Arqam, reassured them, and said that if Umar was coming with good intentions, then it was all right; but if not, then he (Hamza) would run him (Umar) through with his (Umar's) own sword. But it so happened that Umar had come with the intention of accepting Islam, and he did.
The story is told that Umar was going toward Dar-ul-Arqam with the intention of killing Muhammad when a passer-by stopped him, and informed him that his own sister and her husband had become Muslims, and advised him to put his own house in order before undertaking any other grandiose and chimerical project.
Muhammad Husayn Haykal Umar went there (to Dar-ul-Arqam) resolved to kill Muhammad and thus relieve the Quraysh of its burden, restore its ravaged unity, and re-establish respect for the gods that Muhammad had castigated. On the road to Makkah he was met by Nu'aym ibn Abdullah. Upon learning what Umar was about, Nu'aym said, “By God, you have deceived yourself, O Umar! 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?” (The Life of Muhammad) Umar was furious to hear that his sister and her husband had become Muslims.