The sale through Najsh and the ruling on it

Question:
He says: What is the sale of najash, and what is its ruling?

Answer:
Najsh is when a person who does not intend to buy increases the price of the goods, raising the bid only to drive up the value for the customers. This is forbidden. The Messenger of Allah (peace and blessings be upon him) said: Because this harms the Muslims, it is obligatory that no one increase the price of the goods except one who intends to buy them. As for one who bargains in order to benefit the seller or harm the customers, this is forbidden for him, and the price is forbidden if the buyer knows about it and approves it; in that case, it is forbidden. But if he did not know and was not aware, the sin is upon the one who engaged in Najsh. Yes.