وَإِن فاتَكُم شَيءٌ مِن أَزواجِكُم إِلَى الكُفّارِ فَعاقَبتُم فَآتُوا الَّذينَ ذَهَبَت أَزواجُهُم مِثلَ ما أَنفَقوا ۚ وَاتَّقُوا اللَّهَ الَّذي أَنتُم بِهِ مُؤمِنونَ

If any of your wives leave you for the unbelievers, and you subsequently retaliate, then pay those whose wives have gone the equivalent of what they had spent. And be mindful of God, in whom you believe.