In the ninth year of the Hegira envoys from all parts of Arabia came to Mahomet at Medina, to declare the readiness of their several tribes to profess his religion. The same year Mahomet, with an army of thirty thousand men, marched toward Syria, to a place called Tobuc, against the Romans and Syrians, who were making preparation against him, but, upon his approach, retreated. The Mussulmans, in their march back toward Medina, took several forts of the Christian Arabs, and made them tributaries. Upon his return to Medina the Thakishites, having been blockaded in the Taif by the Mussulman tribes, sent deputies offering to embrace Islamism, upon condition of being allowed to retain a little longer an idol to which their people were bigotedly attached. When Mahomet insisted upon its being immediately demolished, they desired to be at least excused from using the Mussulmans' prayers, but to this he answered very justly, "That a religion without prayers was good for nothing." At last they submitted absolutely. During the same year Mahomet sent Abu-Bekr to Mecca, to perform the pilgrimage, and sacrifice in his behalf twenty camels. Presently afterward he sent Ali to publish the ninth chapter of the _Koran_, which, though so placed in the present confused copy, is generally supposed to have been the last that was revealed. It is called "Barat," or Immunity; the purport of it is that the associators with whom Mahomet had made a treaty must, after four months' liberty of conscience, either embrace Islamism or pay tribute. The command runs thus: "When those holy months are expired, kill the idolaters wherever ye shall find them." Afterward come these words, "If they repent, and observe the times of prayer and give alms, they are to be looked upon as your brethren in religion." The same chapter also orders, "That nobody should, not having on the sacred habit, perform the holy circuits round the Kaaba; and that no idolater should make the pilgrimage to Mecca." In consequence, no person except a Mahometan may approach the Kaaba, on pain of death.