Does the rule of no expiation apply to someone who swore an oath concerning another, but the one sworn about did not fulfill the condition, as in my swearing an oath concerning my brother that I will not accompany him if he does not do a certain thing? If expiation is required, is it upon me or upon my guardian? Is it permissible to combine the fasting of expiation with another obligatory fast? Should I wait for financial expiation if I expect to acquire money, or should I proceed with fasting?

If a person swears an oath concerning another and then breaks their oath, expiation is incumbent upon the one who swore the oath, not upon the one concerning whom the oath was sworn. It is commendable for your brother to fulfill your oath if he is able, provided it does not lead to sin or harm. Expiation is obligatory specifically upon the one who breaks the oath, and it is not permissible to combine the fasting of expiation with obligatory fasting. If you do not possess the means to pay for the expiation but are able to fast, then you must fast for three days and not wait for the money, because the preponderant opinion is that expiation must be performed immediately when one is able to do so.