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The angels which kept not their first estate, but left their own habitation, he hath reserved in everlasting chains under darkness unto the judgment of the great day. 1:6
Trivia: What did the devil and Michael the archangel argue about, according to Jude 9?
The author claims to be "Jude, the brother of James," which, if true (which it wasn't, of course), would make him the brother of Jesus, too, since "the Lord's brother" (Galatians 1:19) was the most famous James among believers at the time.
No one knows who wrote this epistle, but whoever it was liked to call people names. Ungodly men ordained to condemnation, filthy dreamers, defilers of the flesh, ungodly sinners, murmurers, complainers, mockers walking in their own ungodly lusts -- all in just 25 verses!
Here are some highlights: