1 Enoch 12:3
1 Before these things, Enoch was hidden, and no one among the children of men knew where he was hidden, where he lived, or what had happened to him. 2 His dealings were with the Watchers, and he spent his days among the holy ones. 3 And I, Enoch, was praising the Lord of majesty and the King of the ages, and lo! the Watchers called me - Enoch the scribe - and said to me: 4 'Enoch, you scribe of righteousness, go, tell the Watchers of heaven who have left the high heaven, the holy eternal place, and have defiled themselves with women, and have acted as the children of earth do, and have taken wives for themselves: You have caused great destruction on the earth:
Jubilees 4:22
20 During the twelfth jubilee, in its seventh week [582-88] he took a wife for himself. Her name was Edni, the daughter of Daniel, the daughter of his father's brother. In the sixth year of this week [587] she gave birth to a son for him, and he named him Methuselah. 21 He was, moreover, with God's angels for six jubilees of years. They showed him everything on earth and in the heavens — the dominion of the sun — and he wrote down everything. 22 He testified to the Watchers who had sinned with the daughters of men because these had begun to mix with earthly women so that they became defiled. Enoch testified against all of them. 23 He was taken from human society, and we led him into the Garden of Eden for his greatness and honor. Now he is there writing down the judgment and condemnation of the world and all the wickedness of mankind.
Notes and References
"... According to Jub. 4:21–23, whose language indicates familiarity with these chapters, after Enoch begat Methuselah at age 65, he spent six jubilees (294 years) with the angels. Thus he would have thereafter returned to earth a short time before he was taken to paradise ( Jub. 5:23). 2 Enoch 1:1 states that the patriarch’s cosmic journey took place in the last year of his life. Both traditions are roughly consonant with 1 Enoch 81:5–10 ..."
Heiser, Michael S. A Companion to the Book of Enoch: A Reader’s Commentary, Vol. 1 (p. 129) Defender Publishing, 2019