A man sold another man foreign currency for cash in exchange for local currency to be paid later, then it became clear to the buyer after a few hours that the market price was lower, so he requested to return the sale

The questioner : Two men, one sold the other cash in foreign currency, dollars, and they parted ways at a certain price. After a few hours, it became clear to the buyer that the market price was lower. Then he requested to return the sale transaction. What is the ruling on this sale? Is it permissible for the buyer to return the sale?

The Shaykh : No, it is not permissible. But how did the sale take place? Why did the Lawgiver make the exchange of possession obligatory? So that such a dispute does not occur. Did the exchange of possession take place? How was the buying and selling conducted?

The questioner : I received only the foreign currency.

The Shaykh : In exchange for what?

The questioner : In exchange for him paying later.

The Shaykh : Local currency.

The questioner : Yes, local currency.

The Shaykh : Yes, is this a trade or fulfilling a need? If it is a trade, the sale is invalid. If it is to fulfill a need, he must deliver the local currency, and it is not permissible for either of them to back out from the other.

The questioner : A man borrowed a loan from another man, or wanted to borrow, so they both went to a gold shop—the adhan was being called—to appraise the value of this money, so that when he wanted to return his money or

The Shaykh : pay it off

The questioner : pay it off, he gave him the same value of this gold in local currency. Is this scenario correct?

The Shaykh : It is valid.

The questioner : It is valid.

The Shaykh : It is known, and this is a good thing, and this is something we do not hear anyone doing.