Hadith 21:228
Sahih (Darussalam)
It was narrated that Abu Hurairah said:
"The Messenger of Allah said: 'If any one of you were to sit on a live coal until it burns his garment, that would be better for him than sitting on a grave."
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ الْمُبَارَكِ، عَنْ وَكِيعٍ، عَنْ سُفْيَانَ، عَنْ سُهَيْلٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لأَنْ يَجْلِسَ أَحَدُكُمْ عَلَى جَمْرَةٍ حَتَّى تَحْرِقَ ثِيَابَهُ خَيْرٌ لَهُ مِنْ أَنْ يَجْلِسَ عَلَى قَبْرٍ "
Original Reference: Sunan an-Nasa'i 2044