And if a person is capable when making the vow...

And if a person is capable when making the vow, but becomes incapable later, his vow will be invalidated, and there is no obligation on him, except when the vow is to fast, in which if the person becomes incapable of fasting, he should, as an obligatory precaution, either give 750 grams of food to poor person as Sadaqah, or give 1.5 kilos of food to a person to fast in behalf of him.

If a person makes a vow that he will perform or abandon a normal permissible act, the performing or abandoning of which has equal merits in Shari`ah, his vow is not in order. But if performing it is better in some respect, and a person makes a vow keeping that merit in view, his vow will be in order. If a person makes a vow to perform an act, he should perform it in strict accordance with his vow.

If he makes a vow to give Sadaqah or to fast on the first day of every month, or to offer prayers of the first of the month, if he performs these acts before that day or after, it will not suffice. Also, if he makes a vow that he will give Sadaqah when a patient recovers, but gives away before the recovery of the patient, it will not suffice.

If a person makes a vow that he will observe fast on a particular day, he should observe fast on that very day; and if he does not observe fast on that day intentionally, he should, besides observing the Qada' for that fast, also give Kaffarah for it. However, travelling for him on that day is permissible, and thus he will not fast. Also, it is not obligatory upon him to make an intention for staying ten days when he is an a journey, so as to be able to fast.

If a person who made the vow could not fast on the particular day because of being on a journey, illness, or in the case of a woman, being in the state of Haydh, or for any good excuse, then he will give Qada' of that fast, and there will be no Kaffarah. If a person, of his own choice and volition, violates his vow, he should give Kaffarah for it. If a person makes a vow to renounce an act for some specified time, he will be free to perform that act after that time has passed.

But if he performs it before that time, due to forgetfulness or hellessness, there is no liability on him. Even then, it will be necessary for him to refrain from that act for the remaining time, and if he repeats that act before it without any excuse, he must give Kaffarah for it.