Rules Regarding Oath (Qasam)

2679. If a person takes an oath that he will perform an act or will refrain from doing an act, for example, that he will fast or he will not smoke; if he does not intentionally act according to his oath, he should give Kaffarah for it, which means he should set a slave free, or he should feed ten indigent persons until they are satisfied, or should provide ten indigent persons with clothes. Moreover, if he is not able to perform these acts, he should fast for three consecutive days.