Charles Spurgeon Commentary Jude 1:14-15

"And to these also Enoch, the seventh from Adam, prophesied, saying, Behold, the Lord came with ten thousands of his holy ones, to execute judgment upon all, and to convict all the ungodly of all their works of ungodliness which they have ungodly wrought, and of all the hard things which ungodly sinners have spoken against him." — Jude 1:14-15 (ASV)

And Enoch also, the seventh from Adam, prophesied of these, saying, Behold, the Lord cometh with ten thousands of his saints, to execute judgment upon all, and to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard speeches which ungodly sinners have spoken against him.

When Enoch thus prophesied, we do not know. That he did so, was revealed to Jude, and he here tells us of it. It was profitable for us that so pointed and plain a testimony of Enoch should not be lost.

And Enoch also, the seventh from Adam, prophesied of these, saying, Behold, the Lord cometh with ten thousand of his saints, to execute judgment upon all, and to convince all that are ungodly among them of all their ungodly deeds which they have ungodly committed, and of all their hard speeches which ungodly sinners have spoken against him.

How Jude knew that Enoch said that, I cannot tell; it is another instance of inspiration.