Sahih Muslim 602
صحيح مسلم#602SahihIbn Umar said:The Messenger of Allah (may peace be opon him) said: Act against the polytheists, trim closely the moustache and grow beard
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: 2:69