What do I need to do to avoid job ban?

If the questioner wants to transfer to a new company I advise him to make sure he does not submit his resignation before obtaining the NoC letter in order to transfer his visa. This is in order to avoid the ban stamped by the Ministry of Labour, especially as the employee might submit his resignation and the employer might then refuse to issue an NoC letter. He should complete one year's continuous service for the company; which is fixed by the Ministry of Labour as a minimum period in order to permit the employee to transfer to another employer.

Source - Gulfnews