The World Federation One Stop Fiqh

Ruling 1708

If a recommended fast of a woman conflicts with her husband’s conjugal rights, it is unlawful for her to keep it. Similarly, with regard to a fast that is obligatory but the day on which it must be kept has not been assigned – for example, a vow that [has been made to keep a fast, but the day of the fast] has not been assigned – if it conflicts with the conjugal rights of her husband, then based on obligatory precaution, the fast is invalid and it does not fulfil the vow. Based on obligatory precaution, the same applies if her husband forbids her to keep a recommended fast or an obligatory fast for which a day has not been assigned, even if it does not conflict with his rights. And the recommended precaution is that she should not keep a recommended fast without his consent.