Quran 49:14 — The Walls (Al-Hujurat)

The Arabs said, "We are Mu'mens (believers)." Say, "You have not believed; what you should say is, 'We are Muslims (submitters),' until belief is established in your hearts." If you obey GOD and His messenger, He will not put any of your works to waste. GOD is Forgiver, Most Merciful.

[49:13] O people, we created you from the same male and female, and rendered you distinct peoples and tribes, that you may recognize one another. The best among you in the sight of GOD is the most righteous. GOD is Omniscient, Cognizant.

[49:15] Mu'mens (believers) are those who believe in GOD and His messenger, then attain the status of having no doubt whatsoever, and strive with their money and their lives in the cause of GOD. These are the truthful ones.