A dead man in debt used to be brought to Allah's Messenger (ﷺ) who would ask, "Has he left anything to re pay his debts?" If he was informed that he had left something to cover his debts the Prophet (ﷺ) would offer the funeral prayer for him; otherwise he would say to the Muslims present there), "Offer the funeral prayer for your friend:"but when Allah helped the Prophet (ﷺ) to gain victory (on his expeditions), he said, "I am closer to the Believers than themselves, so. if one of the Believers dies in debt, I will repay it, but if he leaves wealth, it will be for his heirs.
(the wife of the Prophet) I said, "O Allah's Messenger (ﷺ)! Will you marry my sister, the daughter of Abu Sufyan." The Prophet (ﷺ) said, "Do you like that?" I said, "Yes, for I am not your only wife, and the person I like most to share the good with me, is my sister." He said, "That is not lawful for me." I said, "O Allah's Messenger (ﷺ)! We have heard that you want to marry Durra, 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 stepdaughter, she is unlawful for me, for she is my foster niece. Thuwaiba suckled me and Abu Salama. So you should not present to me your daughters and sisters." Narrated 'Urwa: Thuwaiba had been a slave girl whom Abu Lahab had emancipated.