Surah An-Nisa Verse 20 - English Translation by Ali Unal
Surah An-Nisaوَإِنۡ أَرَدتُّمُ ٱسۡتِبۡدَالَ زَوۡجٖ مَّكَانَ زَوۡجٖ وَءَاتَيۡتُمۡ إِحۡدَىٰهُنَّ قِنطَارٗا فَلَا تَأۡخُذُواْ مِنۡهُ شَيۡـًٔاۚ أَتَأۡخُذُونَهُۥ بُهۡتَٰنٗا وَإِثۡمٗا مُّبِينٗا
But if you still decide to dispense with a wife and marry another and you have given the former (even so much as amounts to) a treasure, do not take back anything thereof. Would you take it back by slandering (for the purpose of contriving the kind of divorce that allows you to take it back) and so committing a flagrant sin