Surah Al-Mumtahanah, Verse 11

وَإِن فَاتَكُمۡ شَيۡءٞ مِّنۡ أَزۡوَٰجِكُمۡ إِلَى ٱلۡكُفَّارِ فَعَاقَبۡتُمۡ فَـَٔاتُواْ ٱلَّذِينَ ذَهَبَتۡ أَزۡوَٰجُهُم مِّثۡلَ مَآ أَنفَقُواْۚ وَٱتَّقُواْ ٱللَّهَ ٱلَّذِيٓ أَنتُم بِهِۦ مُؤۡمِنُونَ١١

wa-in fātakum shayon min azwājikum ilā l-kufāri faʿāqabtum faātū alladhīna dhahabat azwājuhum mith'la mā anfaqū wa-ittaqū l-laha alladhī antum bihi mu'minūna

And if you have lost any of your wives to the disbelievers and you subsequently obtain [something], then give those whose wives have gone the equivalent of what they had spent. And fear Allāh, in whom you are believers.