Sayyiduna Ali (may Allah be pleased with him) narrates: I mentioned the daughter of Hamzah to the Messenger of Allah (peace and blessings be upon him) so that he might marry her, and he (peace and blessings be upon him) said: "She is the daughter of my foster brother."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 2907