The book now known as 1 Enoch is a compilation of at least five smaller books. Chapters 1-36 (or at least 6-36) are usually entitled The Book of the Watchers and this next section The Book of the Similitudes or the Parables of Enoch. A problem for dating these chapters is that the Similitudes have not been attested in the Qumran literature. Although Milik dated this section to A.D. 270, most scholars date the Similitudes after 40 B.C. based on the reference to the Parthians in 56:5:
“In those days, the angels will assemble and thrust themselves to the east at the Parthians and Medes. They will shake up the kings (so that) a spirit of unrest shall come upon them, and stir them up from their thrones; and they will break forth from their beds like lions and like hungry hyenas among their own flocks.”
It is possible this verse refers to a past attack from the east led by the Parthians and Medes. In 40 B.C. a governor of the Parthians name Barzapharnes invaded part of Judea to aid Antigonus II against Hyrcanus II (Josephus, JW 1.13.1–11; Antiq. 14.13.3–14.6). On the other hand, 1 Enoch 56 may be an intertextual allusion to classic eschatological texts like Joel 2:4-5, Zechariah 12; 14; and Ezekiel 38-39. James VanderKam considers a simple identification of these verses with the Parthian invasion is “is not without its problems” and that “one should exercise caution in employing these verses” to date the Similitudes (1 Enoch 2: Chapters 37–82, 209).
A second factor in dating this section is 67:8-13, verses which appear to allude to the last days of Herod the Great. In these verses “a poisonous drug of the body and a punishment of the spirit unto the kings, rulers, and exalted one.” Herod died at the hot springs at Kallirrhoë seeking relief from an excruciating disease (Josephus called this disease “God’s judgment upon him for his sins,” Antiq., 17.6.5). Although this seems to require a date after 4 B.C., but many Enoch scholars now consider an allusion to the death of Herod an interpolation into the text.
It may very well have been a part of the Enoch literature in the late first century B.C., but since the section is missing from the Dead Sea Scrolls, it is impossible to be certain. James Vanderkam suggests a range of 40 B.C. to A.D. 70 for these chapters, although “with some preference for the earlier part of this time span” (1 Enoch 2, 63).
The reason dating the Similitudes is important is the use of the term “son of man” in the Similitudes. (For a basic overview of the issues, see Collins, Apocalyptic Imagination, 177-193). Until the Aramaic fragments of the other four sections of Enoch were found at Qumran, the Similitudes were dated to the pre-Christian era and the phrase “son of man” in the gospels was thought to have been drawn from popular apocalyptic texts of the first century. Because the Qumran fragments are missing the Similitudes, it possible to argue they were not a part of the original, pre-Christian Enoch collection or that they have Christian interpolations.
Even if it is proven the Similitudes pre-date the New Testament, readers should be very cautious describing the relationship between the “son of man” sayings in the Gospels and 1 Enoch.