I heard the Prophet ﷺ saying, "The person who will have the least punishment from amongst the Hell Fire people on the Day of Resurrection, will be a man under whose arch of the feet a smoldering ember will be placed so that his brain will boil because of it."  

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ لَرَجُلٌ تُوضَعُ فِي أَخْمَصِ قَدَمَيْهِ جَمْرَةٌ يَغْلِي مِنْهَا دِمَاغُهُ  

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."  

سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ رَجُلٌ عَلَى أَخْمَصِ قَدَمَيْهِ جَمْرَتَانِ يَغْلِي مِنْهُمَا دِمَاغُهُ كَمَا يَغْلِي الْمِرْجَلُ وَالْقُمْقُمُ  

"Indeed the person among the inhabitants of the Fire punished least [on the Day of Judgment] is a man who has two coals beneath his feet, which cause his brain to boil." Other chains report similar narrations.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ رَجُلٌ فِي إِخْمَصِ قَدَمَيْهِ جَمْرَتَانِ يَغْلِي مِنْهُمَا دِمَاغُهُ  

"Indeed the person among the inhabitants of the Fire punished least [on the Day of Judgment] is a man who has two coals beneath his feet, which cause his brain to boil." Other chains report similar narrations. (Using translation from Tirmidhī 2604)   

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ رَجُلٌ يُجْعَلُ فِي أَخْمَصِ قَدَمَيْهِ نَعْلَانِ مِنْ نَارٍ يَغْلِي مِنْهُمَا دِمَاغُهُ  

I heard the Prophet ﷺ saying, "The person who will have the least punishment from amongst the Hell Fire people on the Day of Resurrection, will be a man under whose arch of the feet a smoldering ember will be placed so that his brain will boil because of it." (Using translation from Bukhārī 6561)  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ لَرَجُلٌ يُوضَعُ فِي أَخْمَصِ قَدَمَيْهِ جَمْرَتَانِ يَغْلِي مِنْهُمَا دِمَاغُهُ  

[Machine] I heard the Messenger of Allah ﷺ saying: "The lightest punishment among the people of Hell on the Day of Resurrection would be for a man who will be wearing a pair of shoes that will be heated with fire to the extent that his brain will be boiling from them." This hadith is considered authentic according to the conditions set by Al-Bukhari and Muslim, but Al-Dhahabi did not mention it in his summary.  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ لِرَجُلٍ يُوضَعُ عَلَى أَخْمَصِ قَدَمَيْهِ جَمْرَةٌ يَغْلِي مِنْهَا دِمَاغُهُ» صَحِيحٌ عَلَى شَرْطِ الشَّيْخَيْنِ وَلَمْ يُخْرِجَاهُ سكت عنه الذهبي في التلخيص  

[Machine] I heard the Messenger of Allah ﷺ saying: "Verily, the lightest punishment for the people of Hell on the Day of Resurrection will be for a man whose Shoes will be full of fire, causing his brain to boil as a pot boils."- And as for the hadith of Abu Sa'eed Al-Khudri  

سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «إِنَّ أَهْوَنَ أَهْلِ النَّارِ عَذَابًا يَوْمَ الْقِيَامَةِ رَجُلٌ فِي أَخْمَصِ قَدَمَيْهِ جَمْرَتَانِ يَغْلِي مِنْهُمَا دِمَاغُهُ كَمَا يَغْلِي الْمِرْجَلُ وَالْقُمْقَمَةُ» وَأَمَّا حَدِيثُ أَبِي سَعِيدٍ الْخُدْرِيِّ  

"أَهْوَنُ أَهْلِ النَّار عذابًا يوم القيامة رَجُلٌ يُوضَعُ في أَخْمَص قَدَمَيه جْمرَتَان يَغْلِى مِنْهُمَا دِمَاغُه" .  

"أَهْوَنُ أَهْلِ النَّار عذابًا يَوْمَ القِيَامَةِ رَجُلٌ يُوضَع في أَخْمَصِ قَدَميهِ جَمْرَتان يَغْلِى مِنْهما دِماغُه".  

"إِنَّ أهونَ أهلِ النَّارِ عذابًا يوم القيامة لَرجُلٌ يُوضَعُ في أَخمَصِ قَدمَيهِ جَمرَتَان يَغلى مِنهُما دِمَاغُهُ كَما يَغلىِ الْمِرجَلُ بالقُمْقُمَ".