إِنَّ إِلَهَكُمْ لَوَاحِدٌ Truly, your god is truly One!' [Qur'an 37:4]
So perform As-Salat , give Zakat and hold fast to Allah . He is your Maula (Patron, Lord), what an Excellent Maula (Patron, Lord) and what an Excellent Helper!"
“O mankind! We created you from a single (pair) of a male and a female, and made you into nations and tribes, that ye may know each other not that ye may despise (each other). Verily the most honored of you in the sight of Allah is (he who is) the most righteous of you. And Allah has full knowledge and is well acquainted (with all things).” (Quran 49:13) (Translation)
Bukhari Volume 8, Book 73, Number 8: