Al-Mumtahanah 60:10 يا ايها الذين امنوا اذا جاءكم المومنات مهاجرات فامتحنوهن الله اعلم بايمانهن فان علمتموهن مومنات فلا ترجعوهن الى الكفار لا هن حل لهم ولا هم يحلون لهن واتوهم ما انفقوا ولا جناح عليكم ان تنكحوهن اذا اتيتموهن اجورهن ولا تمسكوا بعصم الكوافر واسالوا ما انفقتم وليسالوا ما انفقوا ذالكم حكم الله يحكم بينكم والله عليم حكيم ١٠

O you who believe, when the believing women come to you as emigrants, put them to a test. Allah knows best about their faith. So, if you find them faithful, do not send them back to the disbelievers. Neither these (women) are lawful for them, nor are those (disbelievers) lawful for these (women). And give them (the disbelievers) that (dower) which they had paid (to these women). And there is no sin for you if you marry them, when you give them their dowers. And do not hold on to the ties of marriage with the disbelieving women,and ask (their new Non-Muslim husbands to pay to you) that (dower) which you had paid (to your previous wives), and they (the previous Non-Muslim husbands of the Muslim women) should ask (their new Muslim husbands) to pay that (dower) which they had paid (to their previous wives). That is the decision of Allah. He decides between you. And Allah is All-Knowing, All-Wise.