Is money earned from a teaching job at an educational center considered unlawful (haram) if the center's owner asks teachers to help students cheat on exams? Does the principle of "except for him who is compelled thereto and whose heart is at rest with faith" apply to this case? What is the ruling on money earned previously if the teacher stops cheating in the future?

Cheating is forbidden in Islamic law, for the Prophet, peace and blessings be upon him, said: "Whoever cheats us is not of us," and "Whoever cheats is not of me." It is not permissible to obey an official in committing cheating; rather, one must convince him of its prohibition. He can help students by teaching them and reviewing their lessons outside of study hours. As for the money earned from teaching, it is lawful because the salary is due by contract for a permissible work, with the obligation to abstain from cheating.