Surah Al-Mumtahanah (The Test of Faith), Verse 11

وَاِنْ فَاتَكُمْ شَیْءٌ مِّنْ اَزْوَاجِكُمْ اِلَی الْكُفَّارِ فَعَاقَبْتُمْ فَاٰتُوا الَّذِیْنَ ذَهَبَتْ اَزْوَاجُهُمْ مِّثْلَ مَاۤ اَنْفَقُوْا وَاتَّقُوا اللّٰهَ الَّذِیْۤ اَنْتُمْ بِهٖ مُؤْمِنُوْنَ ۟

Wa in faatakum shai'un min azwaajikum ilal kuffaari fa 'aaqabtum fa aatul lazeena zahabat azwaajuhum misla maaa anfaqoo; wattaqul laahal lazeee antum bihee mu'minoon

“And if any of your wives deserts you to the Unbelievers, and ye have an accession (by the coming over of a woman from the other side), then pay to those whose wives have deserted the equivalent of what they had spent (on their dower). And fear Allah, in Whom ye believe.”

Quran 60:11 (Yusuf Ali Translation)