The Book of Jubilees was preserved by the Ethiopian Orthodox. Until the discovery of the Dead Sea Scrolls, it was held to be a parody of Jewish thought. Now we know the book was immensely popular with Jews and Christians until the early Middle Ages. The book re-writes Genesis and Exodus. Jubilees claims a higher authority than those books. It creates a new sacred calendar, and invents the figure we call Satan. I also have something to say about that odious book written at the same time, the Wisdom of Ben Sira.