The ruling on a buyer asking the seller for the price at which he purchased the goods

Question:
Shaykh, if the buyer asks the seller, "For how much did you buy this item?" is the seller required to tell him?

Answer:
Yes, he should tell him so that the buyer can be reassured. Because this encourages the buyer to purchase. If he does not tell him, the buyer might leave, and there is no harm in that, praise be to Allah. However, he must be truthful in this; he should not say, "I bought it for such-and-such," and then raise the price, for that is not the truth. Rather, he would be deceiving the buyer, because this is a form of Najsh (bidding up the price), which the Messenger (peace and blessings be upon him) forbade. Yes.