Surah Al-Baqarah (The Cow), Verse 232

وَاِذَا طَلَّقْتُمُ النِّسَآءَ فَبَلَغْنَ اَجَلَهُنَّ فَلَا تَعْضُلُوْهُنَّ اَنْ یَّنْكِحْنَ اَزْوَاجَهُنَّ اِذَا تَرَاضَوْا بَیْنَهُمْ بِالْمَعْرُوْفِ ذٰلِكَ یُوْعَظُ بِهٖ مَنْ كَانَ مِنْكُمْ یُؤْمِنُ بِاللّٰهِ وَالْیَوْمِ الْاٰخِرِ ذٰلِكُمْ اَزْكٰی لَكُمْ وَاَطْهَرُ وَاللّٰهُ یَعْلَمُ وَاَنْتُمْ لَا تَعْلَمُوْنَ ۟

Wa izaa tallaqtumun nisaaa'a fabalaghna ajalahunna falaa ta'duloo hunna ai yankihna azwaaja hunna izaa taraadaw bainahum bilma' roof; zaalika yoo'azu bihee man kaana minkum yu'minu billaahi wal yawmil aakhir; zaalikum azkaa lakum wa at-har; wallaahu ya'lamu wa antum laa ta'lamoon

“When ye divorce women, and they fulfil the term of their ('Iddat), do not prevent them from marrying their (former) husbands, if they mutually agree on equitable terms. This instruction is for all amongst you, who believe in Allah and the Last Day. That is (the course Making for) most virtue and purity amongst you and Allah knows, and ye know not.”

Quran 2:232 (Yusuf Ali Translation)