So if he divorces her she shall not be lawful to him afterwards until she marries another husband; then if he divorces her there is no blame on them both if they return to each other (by marriage), if they think that they can keep within the limits of Allah, and these are the limits of Allah which He makes clear for a people who know.

And when you have divorced women and they have ended-- their term (of waiting), then do not prevent them from marrying their husbands when they agree among themselves in a lawful manner; with this is admonished he among you who believes in Allah and the last day, this is more profitable and purer for you; and Allah knows while you do not know.

O you who believe! when believing women come to you flying, then examine them; Allah knows best their faith; then if you find them to be believing women, do not send them back to the unbelievers, neither are these (women) lawful for them, nor are those (men) lawful for them, and give them what they have spent; and no blame attaches to you in marrying them when you give them their dowries; and hold not to the ties of marriage of unbelieving women, and ask for what you have spent, and kt them ask for what they have spent. That is Allah's judgment; He judges between you, and Allah is Knowing, Wise.