" fixed the time for us paring the mustache, trimming the fingernails, shaving the pubic hairs and plucking the underarm hairs - that we not leave it for more than forty days."
Jami` at-Tirmidhi Book 43, Hadith 29
← Previous Hadith 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.

Jami` at-Tirmidhi Book 43, Hadith 28 Next Hadith → "The Prophet (ﷺ) would pare, or take from his mustache, and Ibrahim Khalilur-Rahman would do it (as well)."

Jami` at-Tirmidhi Book 43, Hadith 30