Al-Baqarah 232

وَإِذَا طَلَّقْتُمُ ٱلنِّسَآءَ فَبَلَغْنَ أَجَلَهُنَّ فَلَا تَعْضُلُوهُنَّ أَن يَنكِحْنَ أَزْوَٰجَهُنَّ إِذَا تَرَٰضَوْا۟ بَيْنَهُم بِٱلْمَعْرُوفِ ۗ ذَٰلِكَ يُوعَظُ بِهِۦ مَن كَانَ مِنكُمْ يُؤْمِنُ بِٱللَّهِ وَٱلْيَوْمِ ٱلْـَٔاخِرِ ۗ ذَٰلِكُمْ أَزْكَىٰ لَكُمْ وَأَطْهَرُ ۗ وَٱللَّهُ يَعْلَمُ وَأَنتُمْ لَا تَعْلَمُونَ

wa-idhā ṭallaqtumu l-nisāa fabalaghna ajalahunna falā taʿḍulūhunna an yankiḥ'na azwājahunna idhā tarāḍaw baynahum bil-maʿrūfi dhālika yūʿaẓu bihi man kāna minkum yu'minu bil-lahi wal-yawmi l-ākhiri dhālikum azkā lakum wa-aṭharu wal-lahu yaʿlamu wa-antum lā taʿlamūna

And when you divorce women and they have fulfilled their term, do not prevent them from remarrying their [former] husbands if they [i.e., all parties] agree among themselves on an acceptable basis. That is instructed to whoever of you believes in Allāh and the Last Day. That is better for you and purer, and Allāh knows and you know not.