Quran 33:50-51

50 O Prophet, We have made lawful for thee thy wives whom thou hast given their wages and what thy right hand owns, spoils of war that God has given thee, and the daughters of thy uncles paternal and aunts paternal, thy uncles maternal and aunts maternal, who have emigrated with thee, and any woman believer, if she give herself to the Prophet and if the Prophet desire to take her in marriage, for thee exclusively, apart from the believers -- We know what We have imposed upon them touching their wives and what their right hands own -- that there may be no fault in thee; God is All-forgiving, All-compassionate. 51 Thou mayest put off whom thou wilt of them, and whom thou wilt thou mayest take to thee; and if thou seekest any thou hast set aside there is no fault in thee. So it is likelier they will be comforted, and not sorrow, and every one of them will be well-pleased with what thou givest her. God knows what is in your hearts; God is All-knowing, All-clement.