Sahih al-Bukhari, Volume 2, Book 26, Hadith 613 (USC-MSA) ⓘ
Narrated Salim from his father: I heard that Allah's Messenger assumed Ihram with his hair matted together.
حَدَّثَنَا أَصْبَغُ، أَخْبَرَنَا ابْنُ وَهْبٍ، عَنْ يُونُسَ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمٍ، عَنْ أَبِيهِ ـ رضى الله عنه ـ قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُهِلُّ مُلَبِّدًا.
also referenced under: Book 25, Hadith 27 (In-Book) & Hadith 1540 (DarusSalam)