Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "It is much better for one of you to sit on a live coal, which will burn his clothes and get to his skin than to sit on a grave."[Muslim]. (ES)
App reference (ES): Book 18, Hadith 256 (ES)
Arabic/English book reference (ES): Book 18, Hadith 1766 (ES)