Umm Habiba, the daughter of AbuSufyan, reported: The Messenger of Allah (ﷺ) came to me and I said to him: Have you any inclination towards my sister, the daughter of Abu Sufyan (RA) ? He (the Holy Prophet) said: Then what should I do? I said: Marry her. He said: Do you like that? I said: I am not the exclusive (wife) of yours; I, therefore, wish to join my sister in good. He, said: She is not lawful for me. I said: I have been informed that you have given the proposal of marriage to Durrah daughter of Abu Salama. He said: You mean the daughter of Umm Salamah? I said: Yes. He said: Even if she had not been my step-daughter brought up under my guardianship, she would not have been lawful for me, for she is the daughter of my foster-brother (Hamza), for Thuwabia had suckled me and her father. So do not give me the proposal of the marriage of your daughters and sisters.
Umm Habiba, the wife of Allah's Apostle (ﷺ) , reported that she said to Allah's Messenger (ﷺ) : Messenger of Allah, marry my sister 'Azza, whereupon Allah's Messenger (ﷺ) said: Do you like it? She said: Yes, Messenger of Allah, I am not the exclusive wife of yours, and I wish that the person who joins me in good should be my sister. Thereupon Allah's Messenger (ﷺ) said: That is not lawful for me. I said: Messenger of Allah, we discussed that you intend to marry Durrah bint Abu Salama. He (the Holy Prophet) said: You mean the daughter of Abu Salama? She said: Yes, whereupon Allah's Messenger (ﷺ) said: Even if she were not the step-daughter of mine, brought up under my guardianship, she would not have been lawful for me, for she is the daughter of my foster-brother. Thuwabia gave me suck and to Abu Salama (also), so do not offer to me your daughters and sisters.