Jami' at-Tirmidhi — Hadith #29001

Muhammad bin Bashar narrated to us, Yahya bin Saeed Al-Qattan narrated to us, Fitr bin Khalifa narrated to us, Mundhir, who is Al-Thawri, narrated to me on the authority of Muhammad. Ibn al-Hanafiyyah, on the authority of Ali bin Abi Talib, that he said, O Messenger of God, have you considered that if a son is born to me after you, I shall name him Muhammad and give him a nickname? With your nickname. He said, “Yes.” He said, “It was a concession for me.” This is an authentic hadith.