Across the ancient and medieval literature of Judaism, Christianity, and Islam, one finds references to the antediluvian sage Enoch. Both the Book of the Watchers and the Astronomical Book were long known from their Ethiopic versions, which are preserved as part of Mashafa Henok Nabiy ('Book of Enoch the Prophet')--an Enochic compendium known in the West as 1 Enoch. Since the discovery of Aramaic fragments among the Dead Sea Scrolls, these books have...