Sayyidah Umm Habibah bint Abi Sufyan (may Allah be pleased with her) said: (I said:) "O Messenger of Allah (peace and blessings be upon him)! Do you have any interest in our sister, the daughter of Abu Sufyan?" He (peace and blessings be upon him) said: "Meaning what?" She said: "Will you marry her?" He (peace and blessings be upon him) said: "The one who is your sister?" She said: "Yes." He (peace and blessings be upon him) said: "Would you like that?" She said: "Yes, I am not selfish, and the one I would most like to share good with me is my sister." He (peace and blessings be upon him) said: "She is not lawful for me." I said: "I have been told that you are going to marry the daughter of Abu Salamah." He (peace and blessings be upon him) said: "The daughter of Umm Salamah?" The Mother of the Believers (may Allah be pleased with her) said: "Yes." He (peace and blessings be upon him) said: "By Allah! Had she not been brought up in my care, in my lap, she would still not be lawful for me; she is the daughter of my foster brother. Thuwaybah suckled me and her father. So do not send me proposals of your daughters and sisters."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13437