If a person breaks his oath, what is he supposed to do?

Answer

If a person takes an oath that he will perform an act (e.g. that he will fast) or will refrain from doing an act (e.g. that he will not smoke), but does not intentionally act according to his oath, he should give Kaffarah for it, which means he should should fully feed ten indigent persons, 750 grams of food stuffs (wheat or bread or rice). And if he is not able to perform these acts, he should fast for three consecutive days.