(137) باب لاَ يَكُفُّ شَعَرًا
Narrated Ibn `Abbas:
The Prophet (ﷺ) was ordered to prostrate on seven bony parts and not to tuck up his clothes or hair.
Reference: Sahih al-Bukhari 815
In-book reference: Book 10, Hadith 210
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 12, Hadith 779