Quran 2:228 — The Heifer (Al-Baqarah)

The divorced women shall wait three menstruations (before marrying another man). It is not lawful for them to conceal what GOD creates in their wombs, if they believe in GOD and the Last Day. (In case of pregnancy,) the husband's wishes shall supersede the wife's wishes, if he wants to remarry her. The women have rights, as well as obligations, equitably. Thus, the man's wishes prevail (in case of pregnancy). GOD is Almighty, Most Wise.

[2:227] If they go through with the divorce, then GOD is Hearer, Knower.

[2:229] Divorce may be retracted twice. The divorced woman shall be allowed to live in the same home amicably, or leave it amicably. It is not lawful for the husband to take back anything he had given her. However, the couple may fear that they may transgress GOD's law. If there is fear that they may transgress GOD's law, they commit no error if the wife willingly gives back whatever she chooses. These are GOD's laws; do not transgress them. Those who transgress GOD's laws are the unjust.