Jami` at-Tirmidhi 2763
جامع الترمذي#2763SahihNarrated Ibn 'Umar:that the Messenger of Allah (ﷺ) said: "Trim the mustache and leave the beard to grow
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 43:33