Muhammad bin al-Hanafiyyah narrates from his father, Sayyiduna Ali (may Allah be pleased with him), that he said: I said: O Messenger of Allah (peace and blessings be upon him)! If a child is born to me after you, may I name him with your name and give him your kunyah? He (peace and blessings be upon him) said: "Yes." Sayyiduna Ali (may Allah be pleased with him) said: This was a special concession (rukhsah) for me. This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it. Perhaps someone may imagine that the two Shaykhs did not narrate from Fitr (a narrator), but that is not so, for they both mentioned him paired with another narrator in a single chain. The Imams have mentioned a large chapter at this point on the permissibility of a man calling his wife by her name (contrary to the common people's view that it is not permissible). In this regard it is established that he (peace and blessings be upon him) addressed Sayyidah Aishah as "Ya Aishah" and "Ya A'ish" and Sayyidah Umm Salamah as "Ya Umm Salamah", but I have left these out to avoid length, since the two Shaykhs agreed on most of them.