Jami` at-Tirmidhi Book 43, Hadith 27
that the Prophet (ﷺ) said: "Ten are from the Fitrah: Paring the mustache, leaving the beard to grow, Siwak, cleaning the nose with water, paring the fingernails, washing the knuckles, plucking the underarm hair, shaving the pubic hairs, and Intiqas with water."
that the Messenger of Allah (ﷺ) said: "Five are from the Fitrah: Cutting the pubic hair, circumcision, paring the mustache, plucking the under arm hair and trimming the fingernails."
from the Prophet (ﷺ), that he (ﷺ) fixed the time as every forty nights for them to trimming the fingernails, taking from the mustache, and shaving the pubic hairs.