Riyad as-Salihin, Book 18, Hadith 1766 (In-Book) ⓘ
Abu Hurairah (May Allah be pleased with him) said: The Messenger of Allah 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].
عن أبي هريرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : " لأن يجلس أحدكم على جمرة، فتحرق ثيابه، فتخلص على جلده خير له من أن يجلس على قبر" ((رواه مسلم))