(1) باب الْفِطْرَةِ
It was narrated that Abu Hurairah said:
"The Messenger of Allah [SAW] said: 'Five things are of the Fitrah: Circumcision, shaving the pubes, plucking the armpit hair, clipping the nails and trimming the mustache.'" (JA)
Reference (JA): Sunan an-Nasa'i 5043 (JA)
In-book reference (JA): Book 48, Hadith 4 (JA)
English translation (JA): Vol. 6, Book 48, Hadith 5046 (JA)