Quran 60:10

You who believe, test the believing women when they come to you as emigrants- God knows best about their faith- and if you are sure of their belief, do not send them back to the disbelievers: they are not lawful wives for them, nor are the disbelievers their lawful husbands. Give the disbelievers whatever bride-gifts they have paid- if you choose to marry them, there is no blame on you once you have paid their bride-gifts- and do not yourselves hold on to marriage ties with disbelieving women. Ask for repayment of the bride-gifts you have paid, and let the disbelievers do the same. This is God’s judgement: He judges between you, God is all knowing and wise