What is the ruling on working as a quality controller in a cement factory where materials are added to the manufactured cement, thereby changing its type without informing the buyer? Should one leave the job immediately, or can one wait to find an alternative? And what is the ruling on the money saved from this work?

The company's actions of deception, fraud, and cheating are forbidden matters. The role of a quality controller is to prevent deception, and as long as that is not possible, your presence in this job legitimizes and aids deception. Therefore, you must leave your employment with this company, because your work with them is a participation in deception and forgery and an assistance to it, and this is impermissible, due to the Almighty's saying: "And cooperate in righteousness and piety, but do not cooperate in sin and aggression." Furthermore, your work results in harming others, so it is not permissible for you to continue in it, due to the Prophet, peace and blessings be upon him, saying: "There should be no harm nor reciprocating harm."