Surah An-Nisaa Verse 20

وَإِنْ أَرَدتُّمُ اسْتِبْدَالَ زَوْجٍ مَّكَانَ زَوْجٍ وَآتَيْتُمْ إِحْدَاهُنَّ قِنطَارًا فَلَا تَأْخُذُوا مِنْهُ شَيْئًا ۚ أَتَأْخُذُونَهُ بُهْتَانًا وَإِثْمًا مُّبِينًا

Wa in arattumustib daala zawjim makaana zawjin wa aataitum ihdaahunna qintaaran falaa taakhuzoo minhu shai'aa; ataakhuzoonahoo buhtaannanw wa ismam mubeenaa

Translation / The Meaning

But if you want to replace one wife with another and you have given one of them a great amount [in gifts], do not take [back] from it anything. Would you take it in injustice and manifest sin?