Is an employee considered sinful if the employer fails to apply the law regarding the calculation of end-of-service gratuity based on the full wage instead of the basic salary, or is the sin lifted from him for speaking the truth?

He who witnesses a wrongdoing and injustice, and advises and prohibits it according to his ability, and does not assist in it, has done what is required of him, and no sin will befall him. This is based on the Almighty's saying: "O you who have believed, upon you is [the responsibility for] yourselves. Those who have erred will not harm you when you have been guided." And the wronged person has the right to complain and report his case to the responsible authorities. The entitlement of a worker to an end-of-service bonus depends on what was agreed upon in the contract. If there is no explicit text, then the reference is to common work practice and its law.