The ruling on increasing the price of a commodity without the intention of buying it

Question:
The questioner says: Shaykh, I used to sell at a friend’s place in the exhibitions and buy cars. I used to bid up the price of a car even though I did not want to buy it, but only to raise the value of that car. It has become clear to me that I was wrong. What is required of me now?

Answer:
This is forbidden and not permissible. This is what is called *najsh* (bidding up the price), which the Messenger (peace and blessings be upon him) prohibited in his saying: *Najsh* is when a person increases the price of a commodity who does not intend to buy it, but rather intends to raise its value for the others. This is forbidden. And when this becomes clear, the customer who bought it has the right to return the commodity; he does not take it except at its true value. This is forbidden, and it involves harming Muslims and deceiving Muslims. Yes.