structural:scholar_edition, information:classification
Islam

Even though facial grooming is not specifically mentioned within the Qur'an, numerous narrations of hadith (sayings of Muhammad) address personal hygiene, including facial hair maintenance. In one such example, Muhammad advised that men must grow beards, and as to moustaches, cut the longer hairs as to not let them cover the upper lips (as this is the Fitra, the tradition of prophets). Thus, growing a beard while keeping the moustache from covering the upper lip is a well-established tradition in many Muslim societies.