Is an employee permitted to leave work if it was stipulated at the time of the contract that he has the right to terminate the contract due to compelling circumstances, and these circumstances have occurred?

The lease is a binding contract for both parties and cannot be revoked except by their mutual consent. However, if one party stipulates a permissible condition, then they are bound to fulfill it when its cause is realized, due to the saying of the Prophet, peace and blessings be upon him: "Muslims are bound by their conditions," especially if the matter relates to honoring one's parents.