Here are some interesting thoughts from the Bible Exposition Commentary:

Jude was not content simply to remind his readers to pay attention to what Peter had written. He wanted to add his own words of warning by describing what the false teachers were like and what they would do to the church. The Spirit of God led Jude to describe the characteristics of the apostates, reinforcing Peter’s words and, at the same time, adding information. Jude 8–16 and 2 Peter 2:1 parallel and supplement eac...
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