(1) باب الْفِطْرَةِ
It was narrated that Abu Hurairah said:
"Five things are of the Fitrah: Clipping the nails, trimming the mustache, plucking the armpit hairs, shaving the pubes, and circumcision." (Sahih Mawquf)
Reference: Sunan an-Nasa'i 5044
In-book reference: Book 48, Hadith 5
English translation: Vol. 6, Book 48, Hadith 5047