The ruling on working for a company that pays bribes and cheats on specifications

Question:
Honorable Shaykh, may Allah grant you success. Another questioner says: I have been working for a contracting company for four months, and I recently learned that my company, in order to obtain work from major companies, pays bribes to some employees in those companies. Also, when they agree to supply certain materials, they alter the specifications and use inferior materials. His question is: What is the ruling on my work in this company? And what should I do about what I earned in the past months?

Answer:
You must distance yourself from this company and move to another honest job, to clear your conscience and stay away from doubtful matters. What you took while not knowing it was forbidden is yours as payment for your work, and you did not know it was from what is forbidden.