Sahih al-Bukhari 5894
Book 77: Dress · Narrated by Muhammad bin Seereen
Arabic
حَدَّثَنَا مُعَلَّى بْنُ أَسَدٍ، حَدَّثَنَا وُهَيْبٌ، عَنْ أَيُّوبَ، عَنْ مُحَمَّدِ بْنِ سِيرِينَ، قَالَ سَأَلْتُ أَنَسًا أَخَضَبَ النَّبِيُّ صلى الله عليه وسلم قَالَ لَمْ يَبْلُغِ الشَّيْبَ إِلاَّ قَلِيلاً.
English translation
Narrated Muhammad bin Seereen:I asked Anas, "Did the Prophet (ﷺ) dye his hair?" Anas replied, "The Prophet (ﷺ) did not have except a few grey hairs
Reference: Sahih al-Bukhari 5894, Book of Dress. English translation by Dr. Muhammad Muhsin Khan.