I asked Anas, "Did the Prophet (ﷺ) dye his hair?" Anas replied, "The Prophet (ﷺ) did not have except a few grey hairs."
Sahih al-Bukhari Book 77, Hadith 111
← Previous Hadith Allah's Messenger (ﷺ) said, "Cut the moustaches short and leave the beard (as it is).

Sahih al-Bukhari Book 77, Hadith 110 Next Hadith → Anas was asked whether the Prophet (ﷺ) used a a hair dye or not. He replied, "The Prophet (ﷺ) did not have enough grey hair to dye, (such that) if I wanted to count the fading hairs in his beard (I could have)."

Sahih al-Bukhari Book 77, Hadith 112