The ruling on the condition that the borrower repay the money in a different currency

Question:
This question, Honorable Shaykh, says Abu Abdullah: I borrowed a sum of money from a person, and he made it a condition on me, Shaykh Salih, that I repay this debt to him in a different currency.

Answer:
This is not permissible, meaning the condition is not permissible. However, when repaying, there is no harm in giving him the money in a different currency, because this falls under the category of currency exchange. The money in his liability is exchanged into a different currency; this is an exchange, and there is no harm in it. As for the condition, it is not permissible. Yes.