Is it permissible for someone upon whom an expiatory oath (kaffarat yamin) became obligatory, and he did not possess the means, so he delayed it, then later acquired the money, to offer it as feeding ten poor people, or is he obligated to fast; given that he broke his oath when he was not able to feed? And is expiation obligatory for someone who doubts whether he broke his oath?

Whoever breaks an oath while in straitened circumstances must fast. If he gains financial ease before expiating, scholars differ whether he is obligated to feed the poor or to fast. The more cautious approach is to transition to feeding the poor. And whoever doubts whether an oath has been broken, the original presumption is that he has not broken it and his liability is cleared.