From Sahih Bukhari (Hadith 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
Reference: Bukhari 6062