if he divorces her she shall not be lawful for him again until she has married another husband. if the latter divorces her then there is no blame on them for reuniting provided they think they can maintain gods limits. these are gods limits he makes them clear to people who know.
فإن طلقها فلا تحل له من بعد حتى تنكح زوجا غيره فإن طلقها فلا جناح عليهما أن يتراجعا إن ظنا أن يقيما حدود الله وتلك حدود الله يبينها لقوم يعلمون