“This is about the case of a man to whom another man owes a certain amount of assets who denies and takes an oath that he does not owe him anything; if he (plaintiff) must be content with it or there is any remedy for him? He (the Imam) (a.s.), has said, ‘He does not have any right thereafter and so also is the case if he (plaintiff) waives it for the sake of Allah, he does not have any right to ask for it anymore.’”