She said, the Messenger of Allah was asked, "Why do you not consider the daughter of Hamza, Messenger of Allah ﷺ?" Or it was said, "Will you not propose to Bint Hamza, daughter of Abdul-Muttalib?"He replied, "Hamza is my brother through breastfeeding."
قالت: قيل لرسول الله: أين أنت يا رسول الله ﷺ عن ابنة حمزة؟ أو قيل: ألا تخطب بنت حمزة بنت عبد المطلب؟ قال: إن حمزة أخي من الرضاعة.
Muslim narrated it in the Book of Suckling (1448) via Ibn Wahb, who said, Makhrama bin Bukayr informed me, from his father, who said, I heard Abdullah bin Muslim say, I heard Muhammad bin Muslim say, I heard Humayd bin Abdul-Rahman say, I heard Umm Salama say, and he mentioned it.