If the Salesman places a Condition on the Buyer that he must buy new Gold from him if the Buyer sells him old Gold

Question :

What is the ruling regarding some of the owners of the gold shops stipulating a condition on the person selling them used gold that he must buy new gold from them?

Answer:

This is not permissible, because it is conniving to sell gold for gold with some difference between the qualities, and conniving is prohibited in the Islamic law, because it is deception and playing with the Laws of Allâh.

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