O believers, when believing women come to you as emigrants, test them. God knows very well their belief. Then, if you know them to be believers, return them not to the unbelievers. They are not permitted to the unbelievers, nor are the unbelievers permitted to them. Give the unbelievers what they have expended; and there is no fault in you to marry them when you have given them their wages. Do not hold fast to the ties of unbelieving women, and ask what you have expended, and let them ask what they have expended. That is God's judgment; He judges between you; and God is All-knowing, All-wise.