From Sahih Bukhari (Hadith 6297):
Narrated Abu Huraira:The Prophet (ﷺ) said "Five things are in accordance with Al Fitra (i.e. the tradition of prophets): to be circumcised, to shave the pelvic region, to pull out the hair of the armpits, to cut short the moustaches, and to clip the nails
Reference: Bukhari 6297