Ruling on salary if one acquired the certificate by cheating

A man got a job on the basis of a certificate but he cheated in the exam for this qualification. Now he is doing the job well, according to his colleagues. What is the ruling on his salary – is it halal or haram?.

Praise be to Allah, and blessings and peace be upon the Messenger of Allah:

There is nothing wrong in sha Allah, but he has to repent to Allah for cheating. If he is doing the job as it should be done, then there is no sin on him with regard to his earnings, but he made a mistake by cheating, and he has to repent to Allah from that. End quote.