228. Divorced women shall wait concerning themselves for three monthly periods, nor is it lawful for them, to hide what Allah hath created in their wombs, if they have faith in Allah and the Last Day. And their husbands have the better right to take them back in that period, if they wish for reconciliation. And women shall have rights similar to the rights against them, according to what is equitable; but men have a degree (of advantage) over them and Allah is Exalted in Power, Wise.
229. A divorce is only permissible twice: after that, the parties should either hold together on equitable terms or separate with kindness. It is not lawful for you, (men), to take back any of your gifts (from your wives), except when both parties fear that they would be unable to keep the limits ordained by Allah. If ye (judges) do indeed fear that they would be unable to keep the limits ordained by Allah, there is no blame on either of them if she give something for her freedom. These are the limits ordained by Allah; so do not transgress them. If any do transgress the limits ordained by Allah, such persons wrong (themselves as well as others).
230. So if a husband divorces his wife (irrevocably), he cannot, after that, remarry her until after she has married another husband and he has divorced her. In that case there is no blame on either of them if they reunite, provided they feel that they can keep the limits ordained by Allah. Such are the limits ordained by Allah, which He makes plain to those who understand.
231. When ye divorce women, and they fulfill the term of their ('Iddah), either take them back on equitable terms or set them free on equitable terms; but do not take them back to injure them or to take undue advantage; if anyone does that, He wrongs his own soul. Do not treat Allah's Signs as a jest, but solemnly rehearse Allah's favors on you, and the fact that He sent down to you the Book and Wisdom, for your instruction. And fear Allah, and know that Allah is well acquainted with all things.
232. When ye divorce women, and they fulfill the term of their ('Iddah), do not prevent them from marrying their (former) husbands, if they mutually agree on equitable terms. This instruction is for all amongst you, who believe in Allah and the Last Day. That is (the course making for) most virtue and purity amongst you, and Allah knows, and ye know not.
Qur'an 2:228-232