Allah has lots of time to worry about hair! In fact, He's got a thing about it! So if you men wish to gain favour with Allah, you must let your beard grow (and flow), and trim your moustache. Be warned: If you do not, you will not find favour with Allah in the Hereafter! Now you know it. Don’t say you haven’t been warned!
Trim the moustache closely, and let the beard flow (grow)". (Muslim)Laws Pertaining to the Beard
"Act against (contrary) to the polytheists, trim closely the moustache and grow the beard." (Muslim)
"Trim closely the moustache and grow the beard". (Muslim)
"I have no connection with one who shaves, shouts and tears his clothing e.g. in grief or affection". (Bukhari and Muslim)
"Any one who shaves has no claim to the mercy of ALLAH." (Tabraani)
Miscellaneous Laws Pertaining to the Beard
Laws Pertaining to the Hair of the Head
Laws Pertaining to the Moustache
Laws Pertaining to Nasal Hair and Eyebrows
Laws Pertaining to Body Hair
Laws Pertaining to Pubic Hair
Laws Pertaining to Dying One’s Hair
Mark Alexander