سورة Al-Baqarah ( The Cow ) - الآية 237

And if ye divorce them ere ye have touched them but have settled unto them a settlement, then due from you is half of that which ye have settled unless the wives forego, or he in whose hand is the wedding-knot foregoeth, and that ye should forego is nigher unto piety. And forget not grace amongst yourself; verily of that which ye work Allah is the Beholder.