Narrated Qatada:

I asked Anas, "Did the Prophet use to dye (his) hair?" He said, "No, for there were only a few white hairs on his temples."

حَدَّثَنَا أَبُو نُعَيْمٍ، حَدَّثَنَا هَمَّامٌ، عَنْ قَتَادَةَ، قَالَ سَأَلْتُ أَنَسًا هَلْ خَضَبَ النَّبِيُّ ﷺ قَالَ لاَ، إِنَّمَا كَانَ شَىْءٌ فِي صُدْغَيْهِ.