2:230 If he divorces her (for the third time), she shall not be lawful to him after that until she has wed (not for the purpose of remarrying her former husband) another spouse and then if he divorces her it shall be no offense for either of them to return to each other, if they think that they can keep within the Bounds of Allah. Those are the Bounds of Allah. He makes them plain to people who know.
2:231 When you have divorced women and they have reached the end of their waiting period, either keep them in kindness or let them go with kindness. But you shall not keep them, being harmful, in order to transgress. Whoever does this wrongs himself. Do not take the verses of Allah in mockery. Remember the favor of Allah upon you, and what He sent down to you from the Book and Wisdom to exhort you. Fear Allah and know that He has knowledge of everything.