"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.'"
Sunan an-Nasa'i Book 26, Hadith 109
← Previous Hadith "I heard 'Aishah say: The Messenger of Allah said: 'What becomes unlawful (for marriage) through breast-feeding is that which becomes unlawful through birth.'"

Sunan an-Nasa'i Book 26, Hadith 108 Next Hadith → "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."

Sunan an-Nasa'i Book 26, Hadith 110