Read and reflect on verse 237 from Surah Al-Baqara: And if he divorces her [finally], she shall thereafter not be lawful unto him unless she first takes another man for husband; then, if the latter divo...
فَإِنْ طَلَّقَهَا فَلَا تَحِلُّ لَهُ مِنْ بَعْدُ حَتَّىٰ تَنْكِحَ زَوْجًا غَيْرَهُ ۗ فَإِنْ طَلَّقَهَا فَلَا جُنَاحَ عَلَيْهِمَا أَنْ يَتَرَاجَعَا إِنْ ظَنَّا أَنْ يُقِيمَا حُدُودَ اللَّهِ ۗ وَتِلْكَ حُدُودُ اللَّهِ يُبَيِّنُهَا لِقَوْمٍ يَعْلَمُونَ
And if he divorces her [finally], she shall thereafter not be lawful unto him unless she first takes another man for husband; then, if the latter divorces her, there shall be no sin upon either of the two if they return to one another-provided that both of them think that they will be able to keep within the bounds set by God: for these are the bounds of God which He makes clear unto people of [innate] knowledge.