What is the ruling on the money (three dirhams) that a third party receives for mediating between a first party (the owner of ordinary labor) and a second party (the entity requesting skilled laborers), given that the third party supervises and trains the laborers to perform the required work perfectly, where the first party takes 5 dirhams per laborer, and the second party pays 8 dirhams for the same laborer, and the third party keeps the difference?

If you are a mediator between the workers' provider and the employer, and the workers' provider agrees to rent them out for five dirhams, with anything exceeding that amount being your commission, then there is no sin upon you for taking it. The same applies if the agreement between you and the employer is to rent workers for eight dirhams, with anything less than that amount being yours.

However, if you are an agent for one of the parties, either for a fixed fee or voluntarily, and they are unaware of the difference you are taking, then this is not permissible for you. This is because an agent is not allowed to take the surplus for himself without the permission of his principal. It is permissible to take a fee or a commission for agency or brokerage, provided that the party with whom the contract is made is aware of that fee.