Sahih al-Bukhari 6562
Sahih al-Bukhari · Book 81: To make the Heart Tender (Ar-Riqaq) · The description of Paradise and the Fire
Narrated An-Nu`man bin Bashir:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ رَجَاءٍ ، حَدَّثَنَا إِسْرَائِيلُ ، عَنْ أَبِي إِسْحَاقَ ، عَنِ النُّعْمَانِ بْنِ بَشِيرٍ ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ رَجُلٌ عَلَى أَخْمَصِ قَدَمَيْهِ جَمْرَتَانِ يَغْلِي مِنْهُمَا دِمَاغُهُ، كَمَا يَغْلِي الْمِرْجَلُ وَالْقُمْقُمُ".
I heard the Prophet (ﷺ) saying, "The least punished person of the (Hell) Fire people on the Day of Resurrection will be a man under whose arch of the feet two smoldering embers will be placed, because of which his brain will boil just like Al-Mirjal (copper vessel) or a Qum-qum (narrow-necked vessel) is boiling with water."