Al-Baqarah 2:229 الطلاق مرتان فامساك بمعروف او تسريح باحسان ولا يحل لكم ان تاخذوا مما اتيتموهن شييا الا ان يخافا الا يقيما حدود الله فان خفتم الا يقيما حدود الله فلا جناح عليهما فيما افتدت به تلك حدود الله فلا تعتدوها ومن يتعد حدود الله فاولايك هم الظالمون ٢٢٩

Divorce is twice; then either to retain in all fairness, or to release nicely. It is not lawful for you to take back anything from what you have given them, unless both apprehend that they would not be able to maintain the limits set by Allah. Now, if you apprehend that they would not maintain the limits set by Allah, then, there is no sin on them in what she gives up to secure her release. These are the limits set by Allah. Therefore, do not exceed them. Whosoever exceeds the limits set by Allah, then, those are the transgressors.