Quran 33:51 — The Parties (Al-Ahzab)

You may gently shun any one of them, and you may bring closer to you any one of them. If you reconcile with any one you had estranged, you commit no error. In this way, they will be pleased, will have no grief, and will be content with what you equitably offer to all of them. GOD knows what is in your hearts. GOD is Omniscient, Clement.

[33:50] O prophet, we made lawful for you your wives to whom you have paid their due dowry, or what you already have, as granted to you by GOD. Also lawful for you in marriage are the daughters of your father's brothers, the daughters of your father's sisters, the daughters of your mother's brothers, the daughters of your mother's sisters, who have emigrated with you. Also, if a believing woman gave herself to the prophet—by forfeiting the dowry—the prophet may marry her without a dowry, if he so wishes. However, her forfeiting of the dowry applies only to the prophet, and not to the other believers. We have already decreed their rights in regard to their spouses or what they already have. This is to spare you any embarrassment. GOD is Forgiver, Most Merciful.

[33:52] Beyond the categories described to you, you are enjoined from marrying any other women, nor can you substitute a new wife (from the prohibited categories), no matter how much you admire their beauty. You must be content with those already made lawful to you. GOD is watchful over all things.