The Ḳureysh knew that some meeting had taken place, and though they could not bring home the offence to any of the Yethrib pilgrims, they kept a stricter watch on the movements of Moḥammad and his friends after the pilgrims had returned homeward. It was clear that Mekka was no longer a safe place for the Muslims, and a few days after the second pledge Moḥammad told his followers to betake themselves secretly to Yethrib. For two months at the beginning of the eleventh year of the mission (622) the Muslims were leaving Mekka in small companies to make the journey of 250 miles to Yethrib. One hundred families had gone, and whole quarters of the city were deserted, left with empty houses and locked doors, ‘a prey to woe and wind.’ There were but three believers now remaining in Mekka—these were Moḥammad, Aboo-Bekr, and ´Alee. Like the captain of a sinking ship, the Prophet would not leave till all the crew were safe. But now they were all gone save his two early friends, and everything was ready for the journey; still the Prophet did not go. But the Ḳureysh, who had been too much taken by surprise to prevent the emigration, now prepared measures for a summary vengeance on the disturber of their peace and the emptier of their city. They set a watch on his house, and, it is said, commissioned a band of armed youths of different families to assassinate him together, that the blood recompense might not fall on one household alone. But Moḥammad had warning of his danger, and leaving ´Alee to deceive the enemy, he was concealed with Aboo-Bekr in a narrow-mouthed cave on Mount Thór, an hour-and-a-half’s journey from Mekka, before the Ḳureysh knew of his escape. For three days they remained hidden there, while their enemies were searching the country for them. Once they were very near, and Aboo-Bekr trembled:—‘We are but two.’ ‘Nay,’ answered Moḥammad, ‘we are three, for God is with us.’ And a spider, they say, wove its web over the entrance of the cave, so that the Ḳureysh passed on, thinking that no man had entered there. On the third night the pursuit had been almost given over, and the two fugitives took up their journey again. Mounted on camels they journeyed to Yethrib. In eight days they reached the outskirts of the city (September 622). Moḥammad was received with acclamation, and took up his residence among his kindred. The seat of Islám was transferred from Mekka to Yethrib, henceforward to be known as Medina,—_Medeenet-en-Nebee_, ‘the City of the Prophet.’ This is the _Hijreh_, or Flight of the Prophet, from which the Muslims date their history. Their first year began on the 16th day of June of the Year of Grace 622. * * * * *