حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي عَوْنٍ، قَالَ: سَمِعْتُ أَبَا صَالِحٍ
قَالَ: قَالَ عَلِيٌّ ذَكَرْتُ ابْنَةَ حَمْزَةَ لِرَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقَالَ إِنَّهَا ابْنَةُ أَخِي مِنْ الرَّضَاعَةِ
I heard Abu Salih say: Ali (رضي الله عنه) said: I mentioned the daughter of Hamzah (as a potential spouse) to the Messenger of Allah (sallallahu alayhi wa sallam) and he said: ‘She is the daughter of my brother through breastfeeding.’.
Musnad Ahmad 1109, Book 5, Musnad 'Ali Ibn Abi Talib, Hadith 581. 1 min read