The Book of Enoch.
What is the Book of Enoch and where did it come from? The precise publication date of the book is not known. However, it does appear to have been gained additions and interpolations. The only clue to is actual date is that we know that Enoch was the grandfather of Noah. And the Noah apparently mentions the book "And after that my grandfather Enoch gave me all the secrets in the book and in the parables which had been given to him, and he put them together for me in the words of the book of the parables." (The Book of Enoch chapter 68:1) So the Book appears to have been produced before but survived the Great Flood.
Many scholars consider the Book of Enoch to be a Christian, more than a Jewish works, as it is mentioned in a number of scriptures. The author of the apocryphal Epistle of Barnabas mentions the Book not less that three times (4:3, 16:5,6). Other apocryphal works (noncanonical or "hidden") reflect knowledge of the Enoch story of the Watchers, notably the Testaments of the Twelve Patriarchs and the Book of Jubilees. (iv. 17-23) in which the writings of Enoch are mentioned.
In Christian literatures we have seen that the Book of Enoch is quoted, however, it was during 300 AD that the Christian Church discredited the work which eventually was lost until re-discovered in 1773 by the Scottish traveller James Bruce who discovered two manuscripts in Abyssinia. Since that time several editions and translations have been made. The Ethiopic Church even added the Book of Enoch to its official canon.