مسند أحمد

It was narrated that `Alı (رضي الله عنه) said: When we left Makkah, the daughter of Hamzah followed us, crying: O uncle, O uncle. I took her by the hand and gave her to Fatimah and said: Here is your cousin. When we came to Madinah, Ja`far, Zaid bin Harithah and I disputed concerning her, Ja`far said: She is the daughter of my paternal uncle and her maternal aunt is married to me - meaning Asma’ bint `Umais, Zaid said. She is the daughter of my brother. I said: I took her and she is the daughter of my paternal uncle. The Messenger of Allah (ﷺ) said: “As for you, O Ja`far, you resemble me in appearance and attitude. As for you, O Ali, you are of me and I am of you. As for you, O Zaid, you are our brother and our freed slave. The girl should be with her maternal aunt, for the maternal aunt is a mother.” I said: O Messenger of Allah (ﷺ), why don`t you marry her? He said: `She is the daughter of my brother through breastfeeding.“