Hazrat Umm Salamah (may Allah be pleased with her) says that Hazrat Umm Habibah (may Allah be pleased with her) submitted to the Prophet (peace be upon him), "O Messenger of Allah! Would you like to marry my sister, that is, the daughter of Abu Sufyan?" The Prophet (peace be upon him) said, "She is not lawful for me." Hazrat Umm Habibah submitted, "I have heard that you have sent a marriage proposal for Durrah bint Abi Salamah." The Prophet (peace be upon him) inquired, "The daughter of Abu Salamah?" She said, "Yes." The Prophet (peace be upon him) said, "By Allah! Even if she were not in my care, she would not be lawful for me, because she is my foster niece. Both her father and I were suckled by Thuwaibah. Do not invite me to marry your sisters and daughters."