There is no doubt that much of the material recorded in the first five books of the Old Testament is derived from the initiatory rituals of the Egyptian Mysteries. The priests of Isis were deeply versed in occult lore, and the Israelites during their captivity in Egypt learned from them many things concerning the significance of Divinity and the manner of worshiping It. The authorship of the first five books of the Old Testament is generally attributed to Moses, but whether or not he was the actual writer of them is a matter of controversy. There is considerable evidence to substantiate the hypothesis that the Pentateuch was compiled at a much later date, from oral traditions.