It was evident that peace reigned, for on this day the undisturbed freedom of movement over the world, which had until then been accorded the demons, was taken from them. Until then these were so frequently met with, that Moses regularly recited a special prayer whenever going to Mount Sinai, entreating God to protect him from the demons. But as soon as the Tabernacle had been erected, they vanished. Not entirely, it is true, for even now these pernicious creatures may kill a person, especially within the period from the seventeenth day of Tammuz to the ninth day of Ab, when the demons exercise their power. The most dangerous one among them is Keteb, the sight of whom kill men as well as animals. He rolls like a ball and had the head of a calf with a single horn on his forehead.