The condition for the capital in a salam (forward sale) is that it must be in currency

Question:
He said: O Shaykh, is it a condition that the fruit delivered in the meeting of the contract in a salam sale be of a specific type, or can it be something else, such as delivering dates in exchange for sheep, with the sheep being received in the meeting of the contract?

Answer:
In a salam debt, it is a condition that the capital be in currency, specifically minted currency, and not anything else. This is because if the debtor becomes unable to pay, he returns to the currency, which is returned to its owner. If it were anything other than currency, there would be disagreement, whereas there is no disagreement regarding currency, which ends the dispute. Yes.