Muhammad reported,

I asked Anas bin Malik whether the Messenger of Allah ﷺ dyed his hair. He replied that he had only seen a small amount of grey on him. Abu Bakr and Umar, however, did dye their hair, with henna and katam, I believe.

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عن محمد قال

سألت أنس بن مالك هل خضب رسول الله ﷺ قال لم يكن رأى من الشيب إلا يعني يسيرا وقد خضب أبو بكر وعمر أحسب بالحناء والكتم