Saheeh al-Bukhari:

Volume 5, Book 58, Number 222:

Narrated Al-Abbas bin 'Abdul Muttalib:
That he said to the Prophet "You have not been of any avail to your uncle (Abu Talib) (though) by Allah, he used to protect you and used to become angry on your behalf." The Prophet said, "He is in a shallow fire, and had It not been for me, he would have been in the bottom of the (Hell) Fire."