Sahih Muslim 5510
صحيح مسلم#5510SahihAbu Horaira reported Allah's Messenger (ﷺ) as saying:The Jews and the Christians do not dye (their hair), so oppose them
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 37:125