The Ruling on Shaving the Beard and Keeping the Moustache
Question:
I have heard (the Hadith):
"Honor your beards and trim your moustaches." So what is the ruling on leaving the moustache and shaving the beard?
Answer:
What you have heard of his sayings (such as):
Shorten your moustaches and grow your beards."
is correct. That is, trim your moustaches, and do not let it grow long because of the harm and risk from uncleanness. As for the beard, it is for beauty and decoration, this is why Allah has forbidden shaving it. And the Prophet ordered us to grow it and to leave it; and following him and obeying him is obligatory for his adherents and his people.
Source:
Shaykh Iben Jebreen
Fatawa Islamiyah, Vol. 1 Pages 396