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."
Reference: Sunan an-Nasa'i 3306 In-book : Book 26, Hadith 111 English translation : Vol. 4, Book 26, Hadith 3308
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