The Book of Enoch (also 1 Enoch; Ge'ez: መጽሐፈ ሄኖክ, maṣḥafa hēnok) is an ancient Hebrew apocalyptic religious text, ascribed by tradition to Enoch, the great-grandfather of Noah. Enoch contains unique material on the origins of demons and Nephilim, why some angels fell from heaven, an explanation of why the Genesis flood was morally necessary, and prophetic exposition of the thousand-year reign of the Messiah.
The older sections (mainly in the Book of the Watchers) of the text are estimated to date from about 300–200 BC, and the latest part (Book of Parables) probably to 100 BC.
Various Aramaic fragments found in the Dead Sea Scrolls, as well as Koine Greek and Latin fragments, are proof that the Book of Enoch was known by Jews and early Near Eastern Christians. This book was also quoted by some 1st and 2nd century authors as in the Testaments of the Twelve Patriarchs. Authors of the New Testament were also familiar with some content of the story.