كتاب الزينة من السنن
Read the English translation first, with the original Arabic directly underneath.
It was narrated from Abu Hurairah that:
The Messenger of Allah [ﷺ] said: "The Jews and Christians do not dye their hair, so be different from them."
الْيَهُودُ وَالنَّصَارَى لاَ تَصْبُغُ فَخَالِفُوهُمْ