Al-Baqarah 2:229

Attalaqu marratanifa-imsakun bimaAAroofin aw tasreehun bi-ihsaninwala yahillu lakum an ta/khuthoo mimmaataytumoohunna shay-an illa an yakhafaalla yuqeema hudooda Allahi fa-inkhiftum alla yuqeema hudooda Allahifala junaha AAalayhima feema iftadatbihi tilka hudoodu Allahi fala taAAtadoohawaman yataAAadda hudooda Allahi faola-ikahumu aththalimoon

Divorce is twice. Then [after that], either keep [her] in an acceptable manner or release [her] with good treatment. And it is not lawful for you to take anything of what you have given them unless both fear that they will not be able to keep [within] the limits of Allāh. But if you fear that they will not keep [within] the limits of Allāh, then there is no blame upon either of them concerning that by which she ransoms herself. These are the limits of Allāh, so do not transgress them. And whoever transgresses the limits of Allāh - it is those who are the wrongdoers [i.e., the unjust].

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.