Sahih Muslim 511
The Book of Faith
حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ عَبْدِ الْمَلِكِ بْنِ عُمَيْرٍ، عَنْ عَبْدِ اللَّهِ بْنِ الْحَارِثِ، قَالَ سَمِعْتُ الْعَبَّاسَ، يَقُولُ قُلْتُ يَا رَسُولَ اللَّهِ إِنَّ أَبَا طَالِبٍ كَانَ يَحُوطُكَ وَيَنْصُرُكَ فَهَلْ نَفَعَهُ ذَلِكَ قَالَ " نَعَمْ وَجَدْتُهُ فِي غَمَرَاتٍ مِنَ النَّارِ فَأَخْرَجْتُهُ إِلَى ضَحْضَاحٍ " .
Abdullah b. al-Harith reported:I heard Abbas say: I said: Messenger of Allah, verily Abu Talib defended you and helped you; would it be beneficial for him? He (the Holy Prophet) said: Yes; I found him in the lowest part of the Fire and I brought him to the shallow part
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.