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. (Using translation from Nasāʾī 5087)
أَنَّ رَسُولَ اللهِ ﷺ «لَمْ يَكُنْ يُخَضِّبُ إِنَّمَا كَانَ الشَّمَطُ عِنْدَ الْعَنْفَقَةِ يَسِيرًا وَفِي الصُّدْغَيْنِ يَسِيرًا وَفِي الرَّأْسِ يَسِيرًا»