The Book of Enoch. Chapter 1

The Book of Enoch Hebrew: סֵפֶר חֲנוֹךְ, Sēfer Ḥănōḵ; Ge'ez: መጽሐፈ ሄኖክ, Maṣḥafa Hēnok) is an ancient Hebrew apocalyptic religious text, (300 BC) ascribed by tradition to the patriarch Enoch who was the father of Methuselah and the great-grandfather of Noah.

The Book of 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 a prophetic exposition of the thousand-year reign of the Messiah. Three books are traditionally attributed to Enoch, including the distinct works 2 Enoch and 3 Enoch.

The older sections of 1 Enoch (mainly in the Book of the Watchers) of the text are estimated to date from about 300–200 BCE, and the latest part (Book of Parables) is probably to 100 BCE

Source: https://en.wikipedia.org/wiki/Book_of_Enoch

Section I. Chapters I-XXXVI

INTRODUCTION

[Chapter 1]

1 The words of the blessing of Enoch, wherewith he blessed the elect and righteous, who will be 2 living in the day of tribulation, when all the wicked and godless are to be removed. And he took up his parable and said -Enoch a righteous man, whose eyes were opened by God, saw the vision of the Holy One in the heavens, which the angels showed me, and from them I heard everything, and from them I understood as I saw, but not for this generation, but for a remote one which is 3 for to come. Concerning the elect I said, and took up my parable concerning them:
The Holy Great One will come forth from His dwelling,
4 And the eternal God will tread upon the earth, (even) on Mount Sinai,
[And appear from His camp]
And appear in the strength of His might from the heaven of heavens.
5 And all shall be smitten with fear
And the Watchers shall quake,
And great fear and trembling shall seize them unto the ends of the earth.
6 And the high mountains shall be shaken,
And the high hills shall be made low,
And shall melt like wax before the flame
7 And the earth shall be wholly rent in sunder,
And all that is upon the earth shall perish,
And there shall be a judgement upon all (men).
8 But with the righteous He will make peace.
And will protect the elect,
And mercy shall be upon them.
And they shall all belong to God,
And they shall be prospered,
And they shall all be blessed.
And He will help them all,
And light shall appear unto them,
And He will make peace with them'.
9 And behold! He cometh with ten thousands of His holy ones
To execute judgement upon all,
And to destroy all the ungodly:
And to convict all flesh
Of all the works of their ungodliness which they have ungodly committed,
And of all the hard things which ungodly sinners have spoken against Him.

Source: https://www.ccel.org/c/charles/otpseudepig/enoch/ENOCH_1.HTM