It was narrated that 'Ali, may Allah be pleased with him, said: I said: 'O Messenger of Allah, why do you choose wives from among Quraish and not from among us?' He said: 'Do you have anyone in mind?' I said: 'Yes, the daughter of Hamzah.' The Messenger of Allah said: 'She is not permissible for me (to marry); she is the daughter of my brother through breast-feeding.'
It was narrated that Ibn 'Abbas said: Mention was made to the Messenger of Allah of the daughter of Hamzah (as a potential wife). He said: 'She is the daughter of my brother through breast-feeding.' (One of the narrators) Shu'bah said: Qatadah heard this from Jabir bin Zaid.
It was narrated from Ibn 'Abbas that the daughter of Hamzah was suggested to Messenger of Allah (as a potential wife). He said: She is the daughter of my brother through breast-feeding, and what becomes unlawful (for marriage) through breast-feeding is the same as that which becomes unlawful through lineage.