You who have iman! when women who have iman come to you as muhajirun, submit them to a test. Allah has best knowledge of their iman. If you know they are muminun, do not return them to the kuffar. They are not halal for the kuffar nor are the kuffar halal for them. Give the kuffar whatever dowry they paid. And there is nothing wrong in your marrying them provided you pay them their due. Do not hold to any marriage ties with women who are kafir. Ask for what you paid and let them ask for what they paid. That is Allah’s judgement. Allah will judge between them. Allah is All-Knowing, All-Wise.