Al-Qur'aan: If you divorce before and after leaving them, and have appointed a Mahar, then you will have to pay half a month.

Bismillahir rhamanirrahim

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✦ Al Quran : 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, Allah is All-Seer of what you do.

Surah Baqarah (2), 237

from Quran Hadees http://bit.ly/2Asy01c