New Defender's Study Bible Notes
2:4 angels that sinned. There are previous references in the Bible to the sin of Satan, but none to the “angels” that sinned, except in Genesis 6:1-4, where “the sons of God” took control of human women and their progeny. According to Jude 6, they “left their own habitation” in the heavens, seeking to corrupt all flesh on earth. For this crime, God “cast them down to hell” (Greek tartarus, the traditional prison of condemned angels, the lowest compartment of Hades), whence they will eventually be cast into “everlasting fire, prepared for the devil and his angels” (Matthew 25:41).