here's a part from the prophet's last speech. it is one of the important speeches according to islamic beleifs..

"All mankind is from Adam and Eve, an Arab has no superiority over a non-Arab nor a non-Arab has any superiority over an Arab; also a white has no superiority over black nor a black has any superiority over white except by piety and good action. Learn that every Muslim is a brother to every Muslim and that the Muslims constitute one brotherhood. Nothing shall be legitimate to a Muslim which belongs to a fellow Muslim unless it was given freely and willingly. Do not, therefore, do injustice to yourselves.

Remember, one day you will appear before Allah and answer your deeds. So beware, do not stray from the path of righteousness after I am gone"

so that makes clear.. a man is judged by his deeds and submisson to the Almighty

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