Narrated Um Habiba: (daughter of Abu Sufyan) I said, O Allah's Apostle! Marry my sister. the daughter of Abu Sufyan. The Prophet 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 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 Um 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 niece. I and Abu Salama were suckled by Thuwaiba. So you should not present to me your daughters or your sisters (in marriage). Narrated 'Urwa:Thuwaiba was the freed slave girl of Abu Lahb whom he had manumitted, and then she suckled the Prophet. When Abu Lahb died, one of his relatives saw him in a dream in a very bad state and asked him, What have you encountered? Abu Lahb said, I have not found any rest since I left you, except that I have been given water to drink in this (the space between his thumb and other fingers) and that is because of my manumitting Thuwaiba.