It is narrated from Hazrat Umm Salamah (may Allah be pleased with her) that once Hazrat Umm Habibah came to the presence of the Messenger of Allah and said, "O Messenger of Allah, are you interested in my sister?" The Prophet (peace and blessings be upon him) said, "What do you mean?" She said, "You should marry her." The Prophet (peace and blessings be upon him) asked, "Do you like this?" She replied, "Yes, I am not your only wife, so among those who can share in this goodness with me, my sister is the most deserving in my view." The Prophet (peace and blessings be upon him) said, "She is not lawful for me (because you are in my marriage)." She said, "By Allah, I have heard that you are going to send a marriage proposal for Durrah bint Umm Salamah." The Prophet (peace and blessings be upon him) said, "Even if she were lawful for me, I would not marry her, because both I and her father (Abu Salamah) were breastfed by Thuwaibah, the freed slave woman of Banu Hashim. In any case, do not present your sisters and daughters before me."