Sahih al-Bukhari, Volume 8, Book 73, Hadith 88 (USC-MSA) ⓘ

Narrated Salim: that his father said; "When Allah's Messenger mentioned what he mentioned about (the hanging of) the Izar (waist sheet), Abu Bakr said, "O Allah's Messenger! My Izar slackens on one side (without my intention)." The Prophet 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 ‏" ‏‏.‏