Hadith 730
Chapter 5: Musnad 'Ali Ibn Abi Talib - وَمِنْ مُسْنَدِ عَلِيِّ بْنِ أَبِي طَالِبٍ رَضِيَ اللَّهُ عَنْهُ
حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا فِطْرٌ، عَنِ الْمُنْذِرِ، عَنِ ابْنِ الْحَنَفِيَّةِ، قَالَ قَالَ عَلِيٌّ رَضِيَ اللَّهُ عَنْهُ يَا رَسُولَ اللَّهِ أَرَأَيْتَ إِنْ وُلِدَ لِي بَعْدَكَ وَلَدٌ أُسَمِّيهِ بِاسْمِكَ وَأُكَنِّيهِ بِكُنْيَتِكَ قَالَ نَعَمْ فَكَانَتْ رُخْصَةً مِنْ رَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لِعَلِيٍّ.
It was narrated that Ibn al Hanafiyyah said:
`Ali (رضي الله عنه) said: O Messenger of Allah (ﷺ), if I have a son after you are gone, I will call him by your name and give him your kunyah. He said: `Yes.` That was a concession from the Messenger of Allah (ﷺ) to `Ali.
Reference : Musnad Ahmad 730
In-book reference : Book 5, Hadith 163