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
Not lawful to you, [O Muhammad], are [any additional] women after [this], nor [is it] for you to exchange them for [other] wives, even if their beauty were to please you, except what your right hand possesses. And ever is Allah, over all things, an Observer.