Taken from the last sermon of the Prophet Mohammed peace be upon him, this is a wonderful statement that we as muslims must implement and when we see other wise we need to advise our brothers and sisters to follow it.
“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 a black nor a black has any superiority over a 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 belogs to a fellow Muslim unless it was given freely and willingly. Do not therefore do injustice to yourselves. Remember one day you will meet Allah and answer your deeds.”