Is it permissible for the creditor to demand money before the agreed-upon condition for repayment is met?

The majority of scholars hold that the lender has the right to demand a deferred loan even before its due date. Ibn Qudamah stated: "The lender has the right to demand its equivalent immediately," and "The term (of deferment) in it is not binding according to the majority."

If you are able to repay, then they have the right to demand it at any time. However, if you are unable, then you must be granted a delay until you can afford to pay, in accordance with the Almighty's saying: "And if there is one in adversity, then [let there be] a delay until [a time of] ease."