The Ruling on Two Sales in One Sale

He also has a question regarding the same exchange of gold. He says: If the owner of the gold who wants to exchange it for gold of the same type sells it to the shopkeeper from whom he is exchanging, the shopkeeper entices him with an increase so that he will give him more on the other side. However, if he does not want to exchange it, he does not give him that increase or the price given in the exchange. Is this also considered riba or not?
The Shaykh: Repeat... Repeat the question.
The presenter: He says: If the owner of the gold who wants to exchange it for gold of the same type sells it to the shopkeeper who exchanges it with him or exchanges it for him, the shopkeeper entices him with an increase—meaning: the shopkeeper entices the gold owner with an increase—so that he will give him more on the other side, meaning: in the gold that he will give to this person who came to take gold. However, if he does not want to exchange it, he does not give him that increase in the price. Is this considered...?
Answer: This is not permissible either; because it is a sale within a sale, two contracts in one sale, meaning: two transactions in one transaction. Therefore, it is not permissible. For this reason, the Prophet (peace and blessings be upon him) said: So he says to him: If you buy from me, I will increase you by so much, and if you do not buy from me, I will not increase you. The meaning is that he conditioned a sale within a sale and also conditioned an increase if he buys from him, he will increase him by something, and if he does not buy from him, he will not increase him by that thing. So it is not permissible. Yes.