Hadithcore
Riyad as-Salihin, 398

Nu'man bin Bashir (May Allah be pleased with them) reported:

Messenger of Allah (ﷺ) said, "The least tortured man on the Day of Resurrection is one underneath whose feet will be placed two live coal, and his brain will be boiling, and he would think that he is the most tortured, while he is the least tortured". <b>[Al-Bukhari and Muslim]</b>.

وعن النعمان بن بشير رضي الله عنهما قال ‏:‏ سمعت رسول الله صلى الله عليه وسلم يقول‏:‏ إن أهون أهل النار عذابا يوم القيامة لرجل يوضع في أخمص قدميه جمرتان يغلي منهما دماغه، ما يرى أن أحد أشد منه عذابا، وإنه لأهونهم عذابا‏"‏ ‏(‏‏(‏ متفق عليه‏)‏‏)‏

References1 variant
In-Book Reference
Introduction, Hadith 398
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) People are warned against committing sins, lest they will be among the dwellers of Hellfire who are promised severe punishment.<br> 2) The punishment in Hellfire is of varying degrees, the least of which will be thought to be the severest.