Praise be to Allaah.
Firstly:
The command to let the beard grow is narrated in many saheeh
ahaadeeth which were narrated from the Prophet (peace and blessings of
Allaah be upon him), which indicates that it is obligatory to let the beard
grow and it is haraam to shave it. See question no.
1189.
Secondly:
It is part of the tolerant nature of Islam that it permits
one to do something that is haraam and to omit obligatory duties if there is
a valid excuse for doing so, as in cases of necessity and urgent need – such
as eating dead meat when forced to do so, or a woman being treating a male
doctor when necessary. The matter is subject to shar’i guidelines and should
not go any further than is necessary.
Thirdly:
The Muslim must strive to meet his needs without committing
haraam actions as much as possible. If he cannot do that except by
committing a haraam action, it is permissible for him to do it in that
case.
Based on the above, you should strive to do the following:
1 – Look for a gas mask that can be worn with a beard. Some
companies have made gas masks for religiously-committed Jews with beards who
work for airline companies.
2 – Look for another job which does not require you to commit
any haraam actions, even if that job is in another country.
3 – Try to create your own work by doing business and the
like.
If you cannot do any of these things, then there is no sin on
you, in sha Allaah, if you shave your beard, so long as you shorten it only
as much as is necessary; if you can manage to simply shorten it, then it not
permissible for you to shave it off, and so on. Undoubtedly if a person
fears Allaah and keeps his duty to Him as much as he can, Allaah will
suffice him and grant him a way out, as Allaah says (interpretation of the
meaning):
“And whosoever fears Allaah and keeps his duty to Him, He
will make a way for him to get out (from every difficulty).
3. And He will provide him from (sources) he never could
imagine”
[al-Talaaq 65:2-3]
Shaykh Muhammad Saalih al-Munajjid.