Al-Baqara 2:237

If you divorce them before you have consummated the marriage, but you have already fixed their dowry, then pay half the amount agreed upon, unless the wife graciously waives it or the husband graciously pays it in full, but graciousness is closer to piety. Do not forget to be graceful to one another, for Allah is All-Seeing of what you do.

And if you divorce them before you have touched them and you have already specified for them an obligation, then [give] half of what you specified - unless they forego the right or the one in whose hand is the marriage contract foregoes it. And to forego it is nearer to righteousness. And do not forget graciousness between you. Indeed Allāh, of whatever you do, is Seeing.

237. And if you divorce them before you have touched (had a sexual relation with) them, and you have appointed unto them the Mahr (bridal-money given by the husband to his wife at the time of marriage), then pay half of that (Mahr), unless they (the women) agree to forego it, or he (the husband), in whose hands is the marriage tie, agrees to forego and give her full appointed Mahr. And to forego and give (her the full Mahr) is nearer to At-Taqwa (piety, righteousness). And do not forget liberality between yourselves. Truly, Allâh is All-Seer of what you do.

If ye divorce them before ye have touched them and ye have appointed unto them a portion, then (pay the) half of that which ye appointed, unless they (the women) agree to forgo it, or he agreeth to forgo it in whose hand is the marriage tie. To forgo is nearer to piety. And forget not kindness among yourselves. Allah is Seer of what ye do.