From Sahih Bukhari (Hadith 3885):
Narrated Abu Sa`id Al-Khudri:That he heard the Prophet (ﷺ) when somebody mentioned his uncle (i.e. Abu Talib), saying, "Perhaps my intercession will be helpful to him on the Day of Resurrection so that he may be put in a shallow fire reaching only up to his ankles. His brain will boil from it." Narrated Yazid: (as above, Hadith 224) using the words: "will make his brain boil
Reference: Bukhari 3885