Sahih al-Bukhari, Hadith 5904 ⓘ
Narrated Anas: The head-hair of the Prophet used to hang down to his shoulders.
حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، كَانَ يَضْرِبُ شَعَرُ النَّبِيِّ صلى الله عليه وسلم مَنْكِبَيْهِ.
also referenced under: Book 77, Hadith 121 (In-Book) & Volume 7, Book 72, Hadith 790 (USC-MSA)