Sahih Muslim 516
صحيح مسلم#516SahihNu'man b. Bashir was delivering an address and saying:I heard the Messenger of Allah (ﷺ) say: the least suffering for the inhabitants of Hell on the Day of Resurrection would be for the man under whose soles would be placed two embers and his brain would boil on account of them
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 1:422