(14) باب الإِذْنِ بِالْخِضَابِ
It was narrated that Abu Hurairah said:
"The Messenger of Allah [SAW] said: 'The Jews and the Christians do not dye their hair, so be different from them and dye your hair.'"
Reference: Sunan an-Nasa'i 5071
In-book reference: Book 48, Hadith 32
English translation: Vol. 6, Book 48, Hadith 5074