A person bought goods, and when he wanted to sell them, the seller came to buy them from him at a higher price. Is this permissible?

Question:
He says: Honorable Shaykh, may Allah grant you success. A man bought goods from another for a sum of money. Then the buyer wanted to sell those goods. When the seller learned of this, he went to the buyer and said, "I want to buy them from you for more than what I gave you the first time, and I will give you the price after a period of time." Is this sale permissible?

Answer:
Yes, if there was an agreement between them beforehand and a collusion regarding this, there is no harm, provided he bought it, took possession of it, and then wanted to sell it. If the first seller came and said, "I will buy it for a price higher than the price I sold it for," this has no connection to the first sale, and there is no harm. However, if there is collusion and a scheme, this is not permissible. Yes.