2649. Vow means making it obligatory upon oneself to do some good act, or to refrain from doing an act which it is better not to do, for the sake of, or for the pleasure of Allah.
2650. While making a vow, a formula declaration has to be pronounced, though is not necessary that it should be in Arabic. If a person says: "When the patient recovers from his ailment, it will be obligatory upon me to pay $10 to a poor man, for the sake of Allah," his vow will be in order.
2651. It is necessary that the person making a vow is baligh and sane, and makes the vow with free will and intention. If he has been coerced to make a vow, or if he makes it owing to excitement, without any intention or choice, his vow is not in order.
2652. If a person who is feeble-minded, (i.e. one who squanders his property for useless purposes) makes a vow, for example, to give something to poor, his vow is not in order. Similarly, if a bankrupt person makes a vow to pay from the wealth over which he has no right of disposal or discretion, the vow will not be valid.
2653. If a husband disallows his wife to make a vow, her vow will not be valid, if that vow in any way violates the rights of the husband. Similarly, a wife making a vow to pay from her wealth, without her husband's permission, commits an act which is not free from Ishkal, except when the vow is for Hajj, Zakat, Sadaqa or for doing a good turn to her parents, or her blood relations.
2654. If a woman makes a vow with the permission of her husband, he cannot abrogate her vow, or restrain her from fulfiling her vow.
2655. If a child (son or daughter) makes a vow, with or without the permission of his/her father, he/she should fulfil his/her vow. However, if his/her father or mother disallows him/her to fulfil the vow, his/her vow is void, provided that the fulfilment of the vow does not have any priority.
2656. A person can make a vow only for an act which is possible for him to fulfil. If, for example, a person is not capable of travelling up to Karbala on foot, and he makes a vow that he will go there on foot, his vow will not be in order.
2657. If a person makes a vow that he will perform a haraam or makrooh act, or that he would refrain from a wajib or mustahab act, his vow is not valid.