Responsibilities Imposed on Us by the Verses of the Holy Quran 160
60. Sūrat Al-Mumta?anah (The Woman to be examined) 2
In the Name of Allāh, the Most Gracious, the Most Merciful.
10. O you who believe! When believing women come to you as emigrants, examine them; Allāh knows best as to their Faith, then if you ascertain that they are true believers, send them not back to the disbelievers. They are not lawful (wives) for the disbelievers nor are the disbelievers lawful (husbands) for them. But give them (the disbelievers) that (amount of money) which they have spent [as their Mahr(1)] on them. And there will be no sin on you to marry them if you have paid their Mahr to them. Likewise hold not the disbelieving women as wives, and ask for (the return of) that which you have spent (as Mahr) and let them (the disbelievers) ask back for that which they have spent. That is the Judgement of Allāh, He judges between you. And Allāh is All?Knower, All?Wise.
11. And if any of your wives have gone from you to the disbelievers, (as apostates and you asked them to return back your Mahr but they refused)— [then you went out for a Ghazwah (military expedition) against them and gained booty]; then pay (from that booty) to those whose wives have gone, the equivalent of what they had spent (on their Mahr). And fear Allāh in Whom you believe.
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(1) (V.60:10) Mahr: Bridal?money given by the husband to his wife at the time of wedding.