فَإِن طَلَّقَهَا فَلَا تَحِلُّ لَهُ مِن بَعْدُ حَتَّىٰ تَنكِحَ زَوْجًا غَيْرَهُ ۗ فَإِن طَلَّقَهَا فَلَا جُنَاحَ عَلَيْهِمَا أَن يَتَرَاجَعَا إِن ظَنَّا أَن يُقِيمَا حُدُودَ اللَّهِ ۗ وَتِلْكَ حُدُودُ اللَّهِ يُبَيِّنُهَا لِقَوْمٍ يَعْلَمُونَ ٢٣٠

Then if he divorces (for the third time), she will not be lawful for him until she marries some husband other than him. But if he (the latter) also divorces her, in such a case there shall be no sin on both of them (the former husband and the wife) if they return (once more to the wedlock), provided both of them (now) think that they would be able to observe the limits set by Allah. And these are the limits (prescribed) by Allah which He explains to those who have knowledge. (2:230)