سورة Al-Baqarah ( The Cow ) - الآية 229

This type of divorce is up to twice; the woman must then be retained on good terms or released with kindness; and it is not lawful for you to take back from women a part of what you have given them except when both fear that they may not be able to stay within the limits established by Allah; so if you fear that they may not be able to observe the limits of Allah, then it is no sin on them if the woman pays to get her release; these are the limits set by Allah, so do not exceed them; and those who transgress Allah’s limits are the unjust.