The World Federation One Stop Fiqh

Ruling 2467

If after marriage a man becomes a fiṭrī apostate, his wife becomes unlawful for him. If they have had sexual intercourse and she is neither postmenopausal nor a minor, she must observe the ʿiddah of a widow, which will be explained in the rulings pertaining to divorce. In fact, based on obligatory precaution, if they have not had sexual intercourse or she is either postmenopausal or a minor, she must still observe the ʿiddah of a widow. And if the man repents within the ʿiddah period, then based on obligatory precaution, if the couple wish to live together they must contract a marriage again, and if they wish to separate they must get a divorce.