A man gave his brother the idea for a business project, on the condition that he give him 2,000 riyals if the project succeeds. What is the ruling on that?

Question:
May Allah reward you. Your Eminence, father, the questioner says: A man said to his brother, “I will give you the idea for a business project, and I will work with you to the best of my ability until this project succeeds, on the condition that if you make a profit in this project, you give me two thousand riyals.” Is this permissible?

Answer:
If he is a manager of a company in which he is a partner, it is not permissible for him to stipulate a specific amount. Rather, the profit between them should be according to what they agreed upon. The profit may be realized or it may not, and it may be large or small. So he has a shared portion of the profit. As for stipulating a specific amount, this is not permissible in the matter of partnership. Yes.