Question 26: A married woman vowed that if Allaah would restore her son to health, she would observe Sawm (Fasting) every Monday and Thursday of every week of her life. However, her husband did not give her permission to do so, for he feared that her Sawm could have a negative effect on him, as it might subject him to Fitnah (temptation).
– Does she have to make Kaffaarah (expiation) for her vow due to her husband’s rights, as he may be harmed by her Sawm or not?
– If she has to make Kaffarah, should she offer a general one for her vow or one for every day she does not observe Sawm?
– What type of Kaffaarah should she offer: the one for breaking Sawm or other than that?
– If she is allowed to make Kaffaarah and she is able to observe Sawm for a few days, will it be necessary for her to do so on days that her husband permits her to do so or when he is traveling?
– If it is obligatory on her to fulfill the vow she made, will her husband be sinful if he forces her not to fast or has conjugal intercourse with her while she is fasting?
Answer: If the reality is as was mentioned and the woman vowed to observe Sawm every Monday and Thursday of every week if Allaah would restore her son to health and Allaah has cured her son, and if she is married, and her husband has not given his permission, as this vow will harm the lawful marital rights of her husband – the Shar‘ee (Islaamic legal) ruling is that it is obligatory on her to fulfill the vow she made as it is a vow of obedience... read more here.