Its depiction of the origin of sin (angelic rebellion vs. human choice) conflicted with emerging orthodox doctrines.
Most scholars believe 1 Enoch is a compilation of five originally independent works written between 300 BCE and 100 CE: The Book of Enoch
A treatise on celestial mechanics and a 364-day solar calendar, revealed to Enoch by the angel Uriel. Its depiction of the origin of sin (angelic rebellion vs
Explicitly quotes 1 Enoch 1:9 as a prophecy. The Book of Enoch
If you are looking for a physical copy or deep-dive commentary, several modern resources are available: Enoch in the Old Testament and Beyond
Also known as the Similitudes , it introduces the eschatological "Son of Man," a messianic figure who will judge the wicked.