Chapter: The daughter of one's brother through breastfeeding is forbidden in marriage
Ali (Allah be pleased with him) reported having said this: Messenger of Allah, why is it that you select (your wife) from among the Quraish, but you ignore us (the nearest of the kin)? Thereupon he said: Have you anything for me (a suitable match for me)? I said; Yes, the daughter of Hamza, whereupon Allah's Messenger ( صلی اللہ علیہ وسلم ) said: She is not lawful for me, for she is the daughter of my brother by reason of fosterage.
A hadith like this has been narrated on the authority of A'mash with the same chain of transmitters.
Ibn Abbas (Allah be pleased with them) reported: It was proposed that he (the Holy Prophet) be married to the daughter of Hamza, whereupon he said: She is not lawful for me for she is the daughter of my foster-brother, and that is unlawful by reason of fosterage what is unlawful by reason of genealogy.
A hadith like this is narrated on the authority of Hammam, Sa'id, Bishr b 'Umar, but with a small variation of words.
Umm Salama (Allah be pleased with her), the wife of Allah's Apostle ( صلی اللہ علیہ وسلم ), said: It was said to the Messenger of Allah ( صلی اللہ علیہ وسلم ): Is not the daughter of Hamza a suitable match for you? Or it was said: Why don't you propose to marry the daughter of Hamza, the son of Abd al-Muttalib? Thereupon he said: Hamza is my brother by reason of fosterage.