Musnad Ahmad 931
It was narrated from ‘Ali (رضي الله عنه) that the daughter of Hamzah followed them, crying:
O uncle, O uncle. ‘Ali took her by the hand and said to Fatimah (رضي الله عنها), Here is your cousin, look after her. ‘Ali, Zaid and Ja`far disputed concerning her. Ali said: I took her and she is the daughter of my paternal uncle. Ja`far said: She is the daughter of my paternal uncle and her maternal aunt is married to me, Zaid said:She is the daughter of my brother. The Messenger of Allah (ﷺ) ruled that she be given to her maternal aunt and said: `The maternal aunt is like the mother.` Then he said to ‘Ali: `You are of me and I am of you.” And he said to Ja’far: `You resemble me in appearance and attitude.” And he said to Zaid: `You are our brother and our freed slave.` ‘Ali (رضي الله عنه) said to him. O Messenger of Allah     (ﷺ), why don`t you marry the daughter of Hamzah? He said: `She is the daughter of my brother through breastfeeding.`
حَدَّثَنَا حَجَّاجٌ، حَدَّثَنَا إِسْرَائِيلُ، عَنْ أَبِي إِسْحَاقَ، عَنْ هَانِئِ بْنِ هَانِئٍ، وَهُبَيْرَةَ بْنِ يَرِيمَ، عَنْ عَلِيٍّ، أَنَّ ابْنَةَ حَمْزَةَ، تَبِعَتْهُمْ تُنَادِي يَا عَمُّ يَا عَمُّ فَتَنَاوَلَهَا عَلِيٌّ فَأَخَذَ بِيَدِهَا وَقَالَ لِفَاطِمَةَ دُونَكِ ابْنَةَ عَمِّكِ فَحَوِّلِيهَا فَاخْتَصَمَ فِيهَا عَلِيٌّ وَزَيْدٌ وَجَعْفَرٌ فَقَالَ عَلِيٌّ أَنَا أَخَذْتُهَا وَهِيَ ابْنَةُ عَمِّي وَقَالَ جَعْفَرٌ ابْنَةُ عَمِّي وَخَالَتُهَا تَحْتِي وَقَالَ زَيْدٌ ابْنَةُ أَخِي فَقَضَى بِهَا رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لِخَالَتِهَا وَقَالَ الْخَالَةُ بِمَنْزِلَةِ الْأُمِّ ثُمَّ قَالَ لِعَلِيٍّ أَنْتَ مِنِّي وَأَنَا مِنْكَ وَقَالَ لِجَعْفَرٍ أَشْبَهْتَ خَلْقِي وَخُلُقِي وَقَالَ لِزَيْدٍ أَنْتَ أَخُونَا وَمَوْلَانَا فَقَالَ لَهُ عَلِيٌّ رَضِيَ اللَّهُ عَنْهُ يَا رَسُولَ اللَّهِ أَلَا تَزَوَّجُ ابْنَةَ حَمْزَةَ فَقَالَ إِنَّهَا ابْنَةُ أَخِي مِنْ الرَّضَاعَةِ‏.‏