وَاِنْ فَاتَكُمْ شَيْءٌ مِّنْ اَزْوَاجِكُمْ اِلَى الْكُفَّارِ فَعَاقَبْتُمْ فَاٰتُوا الَّذِيْنَ ذَهَبَتْ اَزْوَاجُهُمْ مِّثْلَ مَآ اَنْفَقُوْاۗ وَاتَّقُوا اللّٰهَ الَّذِيْٓ اَنْتُمْ بِهٖ مُؤْمِنُوْنَ ( الممتحنة: ١١ )
Wa in faatakum shai'um min azwaajikum ilal kuffaari fa'aaqabtum fa aatul lazeena zahabat azwaajuhum misla maaa anfaqoo; wattaqul laahal lazeee antum bihee mu'minoon (al-Mumtaḥanah 60:11)
Sahih International:
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 Allah, in whom you are believers. (Al-Mumtahanah [60] : 11)
1 Mufti Taqi Usmani
And if some of your (Non-Muslim) wives have slipped from you, (and their present Non-Muslim husbands do not pay to you the dower as aforesaid,) and you have your turn (of paying dower to the previous Non-Muslim husbands of your present wives), then (instead of paying dower to them,) give those whose wives have slipped the like amount of what they had paid (to them). And fear Allah, the One in whom you believe.