What does Jude 1:6 mean?
In this verse Jude refers to angels that rebelled against God's authority. They are charged with leaving their assigned role and leaving heaven. This statement may refer to the rebellion in heaven that Satan led against God in the dawn of human history (Isaiah 14:12–21; Ezekiel 28:12–19). He led as many as one third of the angels from their abode in heaven. Apparently, Satan and these angels were not content with the positions of authority God had assigned to them. They wanted greater authority and therefore rebelled against God. According to some interpreters, certain rebellious angels, called "sons of God" in Genesis 6:2, cohabited with "the daughters of man" (Genesis 6:1–4). Apparently as a result of this union, Nephilim, also translated as "fallen ones," or "giants" in English Bibles, appeared on earth.Jude's reference to the rebellious angels may point to some other event known to Jude's readers, based on their familiarity with the non-biblical writings of Enoch. This book describes several instances of God's judgment against the fallen angels. At any rate, so far as Jude is using their example here, God punished those spiritual beings. He chained them in a place of darkness, where they await sentencing (2 Peter 2:4), likely when Satan is consigned to eternal punishment in the lake of burning sulfur (Revelation 20:7–10).
Jude 1:5–16 describes the nature, errors, and fate of false teachers plaguing the Christian church. Jude's readers seem to have been acquainted with Israel's history. This passage references Old Testament events to help explain the apostates' sins, the danger they pose, and how the Lord will punish them. Jude references the unbelief of Israel after the Lord delivered them from slavery in Egypt, rebellious angels, the ungodly people of Sodom and Gomorrah, and the dangers of allowing such people to mingle with other believers.
Jude's brief letter describes men at their worst and God at His best. Believers are already on the victorious side! Those who mock God's truth and who follow their own desires all while claiming to be Christians, are the most dangerous kind of unbelievers. These persons pose a danger to themselves and to any Christians they might influence. In response, Christians need to focus on understanding the truth of God's written Word and submitting to His will.