Q: Is it
an act of Sunnah or only desirable to have a beard and trim the moustache?
A: All Praise is due to Allah Alone and peace and blessings be upon His Messenger, his family, and Companions.It is obligatory to leave the beard grow long, for the Prophet (peace be upon him) ordered Muslims to do so. Shaving the beard is unlawful, because the Prophet (peace be upon him) forbade shaving it and ordered Muslims to act unlike the polytheists in this regard. As a rule, the imperative sentence indicates obligation and the prohibitory sentence expresses prohibition. Indeed, trimming or clipping the moustache is one of Sunan-ul-Fitrah (Islamic practices of personal hygiene). It is not permissible for a Muslim to let his moustache grow long, because the Prophet (peace be upon him) said:
“Whoever does not trim his moustache is not one of us.”
The general meanings of the Hadiths also enjoin Muslims to trim the moustache.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.