The Prophet Muhammad, and peace be up on him, announced in his farewell speech the constitution of Islam that was to be observed after his death. He embodied the principles of Islam in this speech saying : "O people Your God is One God and your father is one father, for you are all descendants of Adam, and Adam was created from clay. The most honoured of you in the sight of God is the most righteous of you. No Arab is superior to a non-Arab and no non-Arab is superior to an Arab. No dark-skinned man is superior to a fair-skinned man and no fair-skinned man is superior to a dark-skinned man, except by his piety. I have declared this to you as God is my witness, and may those who are present inform those who are absent