It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: (In all words and actions) oppose the polytheists; trim the moustaches and let the beards grow (that is, leave the beards and do not trim them).

It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that a time limit was set for us regarding trimming the moustache, cutting the nails, plucking the armpit hair, and shaving the pubic hair, that they should not be left for more than forty days.