I said, "O Allah's Messenger (ﷺ)! Marry my sister, the daughter of Abu Sufyan." He said, "Do you like that?"
I said, "Yes, for even now I am not your only wife; and the most beloved person to share the good
with me is my sister." The Prophet (ﷺ) said, "But that is not lawful for me (i.e., to be married to two
sisters at a time.)" I said, "O Allah's Messenger (ﷺ)! By Allah, 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, "By Allah ! Even if she were not my stepdaughter, she would not be lawful for me to marry, for
she is my foster niece, for Thuwaiba has suckled me and Abu Salama; so you should neither present
your daughters, nor your sisters to me."
Sahih al-Bukhari Book 67, Hadith 45
When Abu Talib was in his death bed, the Prophet (ﷺ) went to him while Abu Jahl was sitting beside him.
The Prophet (ﷺ) said, "O my uncle! Say: None has the right to be worshipped except Allah, an expression
I will defend your case with, before Allah." Abu Jahl and `Abdullah bin Umaiya said, "O Abu Talib!
Will you leave the religion of `Abdul Muttalib?" So they kept on saying this to him so that the last
statement he said to them (before he died) was: "I am on the religion of `Abdul Muttalib." Then the
Prophet said, " I will keep on asking for Allah's Forgiveness for you unless I am forbidden to do so."
Then the following Verse was revealed:--
"It is not fitting for the Prophet (ﷺ) and the believers to ask Allah's Forgiveness for the pagans, even if
they were their near relatives, after it has become clear to them that they are the dwellers of the (Hell)
Fire." (9.113)
The other Verse was also revealed:-- "(O Prophet!) Verily, you guide not whom you like, but Allah
guides whom He will ......." (28.56)
Sahih al-Bukhari Book 63, Hadith 109
"Ar-Rubai broke the front tooth of a girls, and they asked them (her people) to forgive her, but they refused. They offered them blood money, but they refused. Then they went to the Prophet and he decreed relation. Anas Bin An-Nadr said: "O Messenger of Allah, will you break the front tooth of Ar-Rubai'? No, by the One Who sent you with the truth, it will not be broken!" He said: "O Anas, what Allah has decreed is retaliation." But the people agreed to forgive her. He (the Prophet) said: "There are among the slaves of Allah who, if they swear by Allah, Allah fulfills their oath."
Sunan an-Nasa'i Book 45, Hadith 52