What is the ruling on an increase in money when exchanging currencies if the value of the currency to which it was transferred rises after a period of transfer?

Debts must be repaid in kind. So, if the debt was in dollars, it must be returned in dollars or its equivalent in other currencies, according to the dollar's value on the day of repayment, even if its value has increased since the day of borrowing. This is supported by the Hadith: "There is no harm in taking the price of its day, as long as you do not part ways while there is still something between you." Paper currency holds the same حكم (ruling) as gold and silver in Islamic legal rulings.