it was narrated from 'Urwah bin Zubair that Zainab bint Abi Salamah told him that Umm Habibah told her that she said to the Messenger of Allah P.B.U.H: "Marry my sister "Azzah." The Messenger of Allah P.B.U.H said: "Would you like that?" She said: "Yes, a Messenger of Allah. I am not the only one living with you and the one who most deserves to share good things with me is my sister." The Messenger of Allah P.B.U.H said: "But that is not permissible for me." She said: "But we thought that you wanted to marry Durrah bint Abi Salamah." The Messenger of Allah P.B.U.H said: "The daughter of Umm Salamah?" She said: "Yes." The Messenger of Allah P.B.U.H said: "Even if she were not my step-daughter who is under my care, she would not be permissible for me, because she is the daughter of my brother through breastfeeding. Thuwaibah breastfed both her father and I. So do not offer your sisters and daughters to me for marriage." (Sahih)
Another chain of narrator with similar wording.