Jude 1:14

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 …

Prophecies were made about them by the seventh from Adam, Enoch, etc. He does not speak against all men, but against all the impious, leaving none of them unpunished. It is added about them:

To what was said above he adds that Enoch also prophesied about the punishment awaiting them from God in the last days, that is, on the day of God's righteous judgment.

Christ's coming to judgment was prophesied of as early as the middle of the patriarchal age, and was therefore even then a received and acknowledged truth.-- The Lord cometh with his holy myriads, including both angels and the spirits of just men made perfect. What a glorious time will that be, when Christ shall come with ten thousand of these!

And Enoch also, the seventh from Adam,....

He enlarges on the seducers' character, and guards against the offence which honest minds might be apt to take at the so early permission of such things, by showing that it was foretold long before that so it must be,

Enoch also, the seventh from Adam - He was the seventh patriarch, and is distinguished thus from Enoch, son of Cain, who was but the third from Adam; this appears plainly from the genealogy, 1Ch 1:1: Adams Seth, Enosh, Kenan, Mahalaleel, Jered, Henoch or Enoch, etc. Of the book of Enoch, from which this prophecy is thought to have been taken, much has been said; but as the work is apocryphal, and of no authority, I shall not burden my page with extracts. See the preface.

There are reasons given by some for thinking the book of Enoch copied from Jude rather than vice versa. It is striking how, from the first, prophecy hastened towards its consummation. The earliest prophecies of the Redeemer dwell on His second coming in glory, rather than His first coming in lowliness (compare Ge 3:15 with Ro 16:20).

And Enoch also, the seventh from Adam - The seventh in the direct line of descent from Adam. The line of descent is Adam, Seth, Enos, Cainan, Mahaleel, Jared, Enoch; see Gen 5:3, following. On the character of Enoch, see the notes at Heb 11:5. Prophesied of these - Uttered prophecies applicable to these men, or respecting just such men as these. It is not necessarily meant that he had these men specifically in his eye; but all that is fairly implied is, that his predictions were descriptive of them. There is no mention made in the writings of Moses of the fact that Enoch was a prophet; but nothing is more probable in itself, and there is no absurdity in supposing that a true prophecy, though unrecorded, might be handed down by tradition. See the 2Ti 3:8 note; Jud 1:9 note. The source from which Jude derived this passage respecting the prophecy of Enoch is unknown. Amidst the multitude of traditions, however, handed down by the Jews from a remote antiquity, though many of them were false, and many of a trifling character, it is reasonable to presume that some of them were true and were of importance. No man can prove that the one before us is not of that character; no one can show that an inspired writer might not be led to make the selection of a true prophecy from a mass of traditions; and as the prophecy before us is one that would be every way worthy of a prophet, and worthy to be preserved, its quotation furnishes no argument against the inspiration of Jude. There is no clear evidence that he quoted it from any book extant in his time. There is, indeed, now an apocryphal writing called “the Book of Enoch,” containing a prediction strongly resembling this, but there is no certain proof that it existed so early as the time of Jude, nor, if it did, is it absolutely certain that he quoted from it. […]