The World Federation One Stop Fiqh

Ruling 2467

If a man becomes a fiṭrī apostate after marriage, 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 on divorce. In fact, based on obligatory precaution, if they have not had sexual intercourse or she is postmenopausal or a minor, she must still observe the ʿiddah of a widow. 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.