لَّا يَحِلُّ لَكَ ٱلنِّسَآءُ مِنۢ بَعْدُ وَلَآ أَن تَبَدَّلَ بِهِنَّ مِنْ أَزْوَٰجٍ وَلَوْ أَعْجَبَكَ حُسْنُهُنَّ إِلَّا مَا مَلَكَتْ يَمِينُكَ ۗ وَكَانَ ٱللَّهُ عَلَىٰ كُلِّ شَىْءٍ رَّقِيبًا
Laa yahillu lakan nisaaa'u mim ba'du wa laaa an tabaddala bihinna min azwaajinw wa law ajabaka husnuhunna illaa maa malakat yameenukk; wa kaanal laahu 'alaa kulli shai'ir Raqeeba
You [Prophet] are not permitted to take any further wives, nor to exchange the wives you have for others, even if these attract you with their beauty. But this does not apply to your slave-girls: God is watchful over all.
No women are lawful to you after this, nor may you exchange them for other wives, even if their beauty pleases you — except those whom your right hand rightfully holds. And God is ever watchful over all things.