Scholars, in the past and the present, have agreed that the most populous groups among human beings are the Arabs and the Turks. Surely you know how the sovereignty of the Arabs was established when they became united in their religion in following their prophet [Muhammad]. As for the Turks, their rivalry with the kings of Persia and the seizure of Khurasan from the latter by their king, Afrāsiyāb, is evidence of their royal origin. None from among the kings of the earth—not Khusraw, nor Caesar nor Alexander nor Nebuchadnezzar—is comparable to them with regard to the extent of their group solidarity (‘asabiyya).