´Narrated Anas:` 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.
Hadith ReferenceSunan at-Tirmidhi / Chapters on Manners / Hadith: 2758
Hadith Gradingالألبانی:صحيح، ابن ماجة (295) | زبیر علی زئی:(2758) إسناده ضعيف / د 4200