وَإِنۡ أَرَدتُّمُ ٱسۡتِبۡدَالَ زَوۡجٖ مَّكَانَ زَوۡجٖ وَءَاتَيۡتُمۡ إِحۡدَىٰهُنَّ قِنطَارٗا فَلَا تَأۡخُذُواْ مِنۡهُ شَيۡـًٔاۚ أَتَأۡخُذُونَهُۥ بُهۡتَٰنٗا وَإِثۡمٗا مُّبِينٗا

Wa in arattumustib daala zawjim makaana zawjin wa aataitum ihdaahunna qintaaran falaa ta'khuzoo minhu shai'aa; ata'khuzoonahoo buhtaannanw wa ismam mubeenaa

But if ye decide to take one wife in place of another, even if ye had given the latter a whole treasure for dower, Take not the least bit of it back: Would ye take it by slander and manifest wrong?

— An-Nisa' (ٱلنِّسَاء), 4:20