The World Federation One Stop Fiqh

Ruling 2299

If a person borrows an amount of money, wheat, barley, or something else that is fungible and its value depreciates or appreciates, he must return the same amount of those items with the same qualities and particulars that effect the desirability of those items. And there is no problem if the borrower and the lender are content with receiving something else instead. However, if he borrows something that is non-fungible, such as sheep, he must give back an amount that is equivalent to the item’s value on the day he took it on loan.