The nature of the contract of reward (ju'alah) and the permissibility of its rescission

Question:
The Shaykh's great [error]. The supplication is that he leave you sitting, and that you do not [do something] without [proper] conduct.

Answer:
The contract of reward (ju'alah) is not a contract of favor; it is a contract of acquisition, a contract of acquisition. Also, the contract of reward is a permissible contract, yes. It is not a binding contract for the one who offers the reward, because he may rescind it. He says, "Did you lower it?" If he lowered it before the worker began the work, he is entitled to nothing. But if it was after he had worked, he is entitled to the wage of its equivalent, the wage of its equivalent for the effort he exerted, because the effort does not go back.