Narrated Umm Ḥabiba, daughter of Abu Sufyân I said, "O Allah's Messenger (ﷺ)! Marry my sister, the daughter of Abu Sufyân. The Prophet (ﷺ) said." Do you like that?" I replied, "Yes, for even now I am not your only wife and I like that my sister should share the good with me." The Prophet (ﷺ) said, "But that is not lawful for me." I said, We have heard that you want to marry the daughter of Abu Salama." He said." (You mean) the daughter of Umm Salama?" I said, "Yes." He said, Even if she were not my step-daughter, she would be unlawful for me to marry as she is my foster suckling niece. I and Salama were suckled by Thuwaiba. So you should not present to me your daughters or your sisters (in marriage). [7:38-O.B]