How can a debt be repaid after the death of the creditor, knowing that the creditor was aware of the debtor's situation?

The debtor must repay the debt when it is due, or to the creditor's heirs if the creditor dies, because debt is a trust. The creditor's knowledge of the debtor's inability to pay does not waive the obligation to pay whenever the debtor becomes able, because the Prophet, peace and blessings be upon him, said: "Indeed, it is not lawful for a person to take anything from his brother's property except with his good will."