What is the ruling on participating as a worker in a restaurant project whose capital comes from a usurious loan, knowing that the project owner offered the worker a share of the profit on condition that he undertakes the management of the project?

The prohibition of money is not related to the money itself, but to the liability of the one who takes it. Therefore, it is permissible to work in a restaurant financed by an interest-based loan if the work itself is lawful. As for managing a restaurant for a percentage of the profit, there is a difference of opinion among scholars. The majority forbid it due to the uncertainty in the wage, while one narration from Ahmad permits it.