You should not repay a debt while your bankruptcy case is still open. You didn't specify whether you've already received your discharge or not. After the discharge, no problem. But if you pay one creditor while the case is still pending, you are in violation of the trust. The trustee has to make all decisions about which creditors, if any, can be paid how much from your assets and/or income. In filing, you have handed your financial matters over to him for the duration of the case.