Sahih Muslim
The Book of Purification (Kitab Al-Taharah)
Book Number: 002 / Hadith Number: 495
Abu Huraira reported: Five are the acts quite akin to the Fitra, or five are the acts of Fitra: circumcision, shaving the pubes, cutting the nails, plucking the hair under the armpits and clipping the moustache.