2. Bekare · verses 229–230

ٱلطَّلَٰقُ مَرَّتَانِۖ فَإِمۡسَاكُۢ بِمَعۡرُوفٍ أَوۡ تَسۡرِيحُۢ بِإِحۡسَٰنٖۗ وَلَا يَحِلُّ لَكُمۡ أَن تَأۡخُذُواْ مِمَّآ ءَاتَيۡتُمُوهُنَّ شَيۡـًٔا إِلَّآ أَن يَخَافَآ أَلَّا يُقِيمَا حُدُودَ ٱللَّهِۖ فَإِنۡ خِفۡتُمۡ أَلَّا يُقِيمَا حُدُودَ ٱللَّهِ فَلَا جُنَاحَ عَلَيۡهِمَا فِيمَا ٱفۡتَدَتۡ بِهِۦۗ تِلۡكَ حُدُودُ ٱللَّهِ فَلَا تَعۡتَدُوهَاۚ وَمَن يَتَعَدَّ حُدُودَ ٱللَّهِ فَأُوْلَٰٓئِكَ هُمُ ٱلظَّٰلِمُونَ

Alttalaqu marratani faimsakun bimaAAroofin aw tasreehun biihsanin wala yahillu lakum an takhuthoo mimma ataytumoohunna shayan illa an yakhafa alla yuqeema hudooda Allahi fain khiftum alla yuqeema hudooda Allahi fala junaha AAalayhima feema iftadat bihi tilka hudoodu Allahi fala taAAtadooha waman yataAAadda hudooda Allahi faolaika humu alththalimoona

A divorce is only permissible twice: after that, the parties should either hold Together on equitable terms, or separate with kindness. It is not lawful for you, (Men), to take back any of your gifts (from your wives), except when both parties fear that they would be unable to keep the limits ordained by Allah. If ye (judges) do indeed fear that they would be unable to keep the limits ordained by Allah, there is no blame on either of them if she give something for her freedom. These are the limits ordained by Allah; so do not transgress them if any do transgress the limits ordained by Allah, such persons wrong (Themselves as well as others).

فَإِن طَلَّقَهَا فَلَا تَحِلُّ لَهُۥ مِنۢ بَعۡدُ حَتَّىٰ تَنكِحَ زَوۡجًا غَيۡرَهُۥۗ فَإِن طَلَّقَهَا فَلَا جُنَاحَ عَلَيۡهِمَآ أَن يَتَرَاجَعَآ إِن ظَنَّآ أَن يُقِيمَا حُدُودَ ٱللَّهِۗ وَتِلۡكَ حُدُودُ ٱللَّهِ يُبَيِّنُهَا لِقَوۡمٖ يَعۡلَمُونَ

Fain tallaqaha fala tahillu lahu min baAAdu hatta tankiha zawjan ghayrahu fain tallaqaha fala junaha AAalayhima an yatarajaAAa in thanna an yuqeema hudooda Allahi watilka hudoodu Allahi yubayyinuha liqawmin yaAAlamoona

So if a husband divorces his wife (irrevocably), He cannot, after that, re-marry her until after she has married another husband and He has divorced her. In that case there is no blame on either of them if they re-unite, provided they feel that they can keep the limits ordained by Allah. Such are the limits ordained by Allah, which He makes plain to those who understand.