Sunan an-Nasa'i, Volume 6, Book 48, Hadith 5090 (DarusSalam) ⓘ
It was narrated from Anas that: The Messenger of Allah [SAW] did not dye his hair; his gray hair were only a little beneath his lower lip and at his temples, and a little on his head.
أَخْبَرَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، قَالَ حَدَّثَنَا عَبْدُ الصَّمَدِ، قَالَ حَدَّثَنَا الْمُثَنَّى، - يَعْنِي ابْنَ سَعِيدٍ - قَالَ حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَمْ يَكُنْ يَخْضِبُ إِنَّمَا كَانَ الشَّمَطُ عِنْدَ الْعَنْفَقَةِ يَسِيرًا وَفِي الصُّدْغَيْنِ يَسِيرًا وَفِي الرَّأْسِ يَسِيرًا .
also referenced under: Hadith 5087 (Reference) & Book 48, Hadith 48 (In-Book)