(18) باب فِي الْخِضَابِ
Thabit said that Anas was asked about the hair-dye of the Prophet (ﷺ). He replied:
He did not dye his hair, but Abu Bakr and 'Umar dyed their hair. (ID)
Reference (ID): Sunan Abi Dawud 4209 (ID)
In-book reference (ID): Book 35, Hadith 51 (ID)
English translation (ID): Book 34, Hadith 4197 (ID)