Sahih al-Bukhari 6062
Narrated Salim:
that his father said; "When Allah's Messenger (ﷺ) mentioned what he mentioned about (the hanging of) the 
Izar (waist sheet), Abu Bakr said, "O Allah's Messenger (ﷺ)! My Izar slackens on one side (without my 
intention)." The Prophet (ﷺ) said, "You are not among those (who, out of pride) drag their Izars behind 
them."
حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا مُوسَى بْنُ عُقْبَةَ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم حِينَ ذَكَرَ فِي الإِزَارِ مَا ذَكَرَ، قَالَ أَبُو بَكْرٍ يَا رَسُولَ اللَّهِ إِنَّ إِزَارِي يَسْقُطُ مِنْ أَحَدِ شِقَّيْهِ‏.‏ قَالَ ‏
"‏ إِنَّكَ لَسْتَ مِنْهُمْ ‏"‏‏.‏