These simple words, uttered in a tone of inspired conviction, banished all hesitation; smoothing away all jealousy as if by magic; and the noblest and most famous among all the chieftains, together with the most humble soldiers, came enthusiastically to obey the commands of the stripling. When the expedition marched into the "Farewell Pass," the Prophet was deeply moved as he saw his troops disappear. The superhuman faith animating the warriors at the parting hour proved to him that no obstacle could bar their way on the road to victory and that the irresistible torrent of Islam, like unto the salutary overflow of a wadi, was about to inundate the world and bring it the prolific germs of its new civilisation. Meanwhile, it was not long before the alarming news, relating to the Prophet's illness, stopped Usama's forward progress, bringing him back to Al-Madinah. About that time, the Apostle received a letter, couched in these terms: "Musailimah, the Prophet of Allah, to Mohammad, the Prophet of Allah. Peace be with thee, I am thy associate. Let the exercise of authority be divided between us. Half the earth is mine, and half belongeth to the Quraish. But the Quraish are a greedy people, and will not be satisfied with a fair division." The author of this epistle, Musailimah, Prince of the Yamama, had recently been converted to Islam; and then, fully appreciating the majesty of the part played by the Prophet, this pretender planned with monstrous pride to play the some part in his turn. To the envoys bringing the impudent missive, Mohammad replied: 'Were it not that your situation as ambassadors causeth me to look upon your lives as sacred, I would have you beheaded.' And he handed them this answer: "Mohammad, the Prophet of Allah to Musailimah, the Impostor. Peace be with those who follow the right road! The earth is Allah's, and He giveth it to whom he will. Those only prosper who fear the Lord!" Both Musailimah and Al-Aswad, another impostor, soon found out the danger run by those who enacted the part of Prophet without having been called by Allah. They expiated their temerity most cruelly. The Prophet's illness became daily more serious. He grew so weak that he could only move about by dint of the most painful efforts. Being in the house of Maimunah, he sent for his other wives. His usual habit was to pass the night in turn, impartially, at each of their dwellings; but feeling himself weighed down by intense suffering, he begged them to let him remain with Ayishah alone for the duration of his illness; and to this they consented.