Narrated Ibn `Abbas: The Prophet said about Hamza's daughter, "I am not legally permitted to marry her, as foster relations are treated like blood relations (in marital affairs). She is the daughter of my foster brother."
Hadith ReferenceSahih Bukhari / The Book of Witnesses / Hadith: 2645
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة