Sunan Ibn Majah
1566
Sahih+3

It was narrated from Abu Hurairah said:The Messenger of Allah (ﷺ) said: “If one of you were to sit on a live coal that burns him, that would be better for him than if he were to sit on a grave.”

SahihAl-Albani
SahihMuhammad Fouad Abd al-Baqi