The following is an excerpt from the last sermon of the Prophet Muhammad (peace be upon him). He delivered this sermon during his last pilgrimage to Mecca (Hajj), only months before he passed away in 632 AD (10 AH).
"All humankind is from Adam and Eve. An Arab has no superiority over a non-Arab, nor does a non-Arab have any superiority over an Arab. Also, a white person has no superiority over a black person, nor does someone who is black have any superiority over someone who is white -- except by piety and good action."
Abu Dharr said the Prophet told him: "You are not better than people (of other races) unless you excel them in piety."
Al-Tirmidhi, Hadith 1361