What must the heirs do concerning a usurious loan their father took from a Syrian bank before his death, and how can they repay his debts and repent from this loan?

If the father borrowed a usurious loan out of ignorance of its prohibition, then he is hopefully not sinful. The heirs must repay the father's debt from his estate, and they are not obliged to pay the usurious increase to the bank unless they are forced to do so. If the father did not leave enough to repay his debt, the heirs are not obliged to donate for its repayment; rather, it is recommended. The heir stands in the place of the deceased regarding what he left behind, and he is not required to pay more than what he received from the estate.