William Muir,
The Caliphate: Its Rise, Decline and Fall…
“ Now as well as later on there was also the mutual jealousy of the two cities of Mecca with its southern Arab population, and Medina with its northern. Even in Medina, cradle of the Faith, the Aus were impatient of the Khazraj and both were jealous of the Ansar. The only authority recognised by a Bedawi is that of his tribal chief, and even that sits lightly. To him freedom is life and dependence on a central power most hateful. If nothing external had supervened, he would soon have shaken off the yoke of Islam, and Arabia would have returned to its primeval state. ”
