Lady Umm al-Husayn (may Allah be pleased with her) narrates: I saw the Messenger of Allah (peace and blessings be upon him) during the Farewell Pilgrimage, he was delivering a sermon to the people, and he was wearing a cloak, which he had wrapped under his armpit, and the muscle of his arm was trembling. And I heard him (peace and blessings be upon him) say: "Listen and obey, even if a slave with a mutilated nose and ears, an Abyssinian, is appointed as your leader/ruler over you, as long as he establishes the Book of Allah among you."