فَإِن طَلَّقَهَا فَلَا تَحِلُّ لَهُۥ مِنۢ بَعْدُ حَتَّىٰ تَنكِحَ زَوْجًا غَيْرَهُۥ ۗ فَإِن طَلَّقَهَا فَلَا جُنَاحَ عَلَيْهِمَآ أَن يَتَرَاجَعَآ إِن ظَنَّآ أَن يُقِيمَا حُدُودَ ٱللَّهِ ۗ وَتِلْكَ حُدُودُ ٱللَّهِ يُبَيِّنُهَا لِقَوْمٍ يَعْلَمُونَ
fa-in ṭallaqahā falā taḥillu lahu min baʿdu ḥattā tankiḥa zawjan ghayrahu fa-in ṭallaqahā falā junāḥa ʿalayhimā an yatarājaʿā in ẓannā an yuqīmā ḥudūda l-lahi watil'ka ḥudūdu l-lahi yubayyinuhā liqawmin yaʿlamūna
And if he has divorced her [for the third time], then she is not lawful to him afterward until [after] she marries a husband other than him. And if he [i.e., the latter husband] divorces her [or dies], there is no blame upon them [i.e., the woman and her former husband] for returning to each other if they think that they can keep [within] the limits of Allāh. These are the limits of Allāh, which He makes clear to a people who know [i.e.,understand].
— Saheeh International
If a husband re-divorces his wife after the second divorce, she will not be lawful for him until she has taken another husband; if that one divorces her, there will be no blame if she and the first husband return to one another, provided they feel that they can keep within the bounds set by God. These are God’s bounds, which He makes clear for those who know.
— M. A. S. Abdel Haleem
And if he has divorced her (the third time), then she is not lawful unto him thereafter until she has married another husband. Then, if the other husband divorces her, it is no sin on both of them that they reunite, provided they feel that they can keep the limits ordained by Allâh. These are the limits of Allâh, which He makes plain for the people who have knowledge.
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali