It was narrated from Umm Habibah that she said:
O Messenger of Allah, what do you think of my sister? He said: What for? She said: For marriage. He said: Would you like that? She said: Yes; I do not have you all to myself, and I would like to share this goodness with my sister. He said: She is not permissible for me (to marry). She said: But I heard that you want to marry Durrah, the daughter of Umm Salamah. He said: The daughter of Umm Salamah? She said: Yes. He said: By Allah, even if she were not my stepdaughter she would not be permissible for me (to marry), because she is the daughter of my brother through breast-feeding. Do not offer your daughters and sisters to me in marriage.