My referral from the Qur'an state as such...
"O Prophet! We have made lawful to thee thy wives to whom thou hast paid their dowers; and those whom thy right hand possesses out of prisoners of war whom God has assigned to thee; and daughters of thy paternal uncles and aunts, and daughters of thy maternal uncles and aunts, who migrated (from Mekkah) with thee; and any believing woman who dedicates her soul to the Prophet if the Prophet wishes to wed her;- this only for thee, and not for Believers (at large); We know what We have appointed for them as to their wives and the captives whom their right hands posses;- in order that there should be no difficulty for thee. And God is Oft-forgiving, Most Merciful."
[Surah 33:50]