(16) باب خِصَالِ الْفِطْرَةِ
Anas reported:
A time limit has been prescribed for us for clipping the moustache, cutting the nails, plucking hair under the armpits, shaving the pubes, that it should not be neglected far more than forty nights.
Reference: Sahih Muslim 258
In-book reference: Book 2, Hadith 66
USC-MSA web (English) reference(deprecated numbering scheme): Book 2, Hadith 497