Sahih al-Bukhari 5894
Sahih al-Bukhari · Book 77: Dress · What is said about grey hair
Narrated Muhammad bin Seereen:
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.
I asked Anas, "Did the Prophet (ﷺ) dye his hair?" Anas replied, "The Prophet (ﷺ) did not have except a few grey hairs."