14 Enoch, the seventh from Adam. The Enoch of Gen. 5:24 is seventh from Adam if Adam is counted as first. In vv. 14, 15, Jude quotes almost verbatim from a popular apocryphal work, the Book of Enoch or 1 Enoch. In doing so Jude does not imply that 1 Enoch is divinely inspired or that it was written by Enoch himself (Gen. 5:24). The source he uses was familiar to his readers and would be useful for confirming his theme of coming divine judgment on the ungodly (Introduction: Interpretive Difficulties).

prophesied. In saying that Enoch “prophesied” about these men, Jude neither confirms nor denies the popular attribution of this apocryphal text to the biblical Enoch. The quotation from 1 Enoch, in agreement with a host of Old Testament prophecies (e.g., Dan. 7:9, 10; Zech. 14:3–5), teaches that God will come with His heavenly hosts to judge the wicked, and Jude is justified in applying this biblical idea to his specific situation.

holy ones. Probably a reference to the angelic host that will accompany the Lord’s return (Zech. 14:5; Matt. 25:31).