Jami` at-Tirmidhi 2604
جامع الترمذي#2604SahihAn-Numan bin Bashir narrated that the Messenger Of Allah (s.a.w) said:"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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 39:32