What does Jude teach about the characteristics of false teachers?

In Jude 4, the author describes false teachers as ungodly men who turn the grace of God into lasciviousness and deny Jesus Christ. He emphasizes that these individuals have crept into the church unnoticed, with a character that is contrary to the teachings of the Gospel. They are characterized by a lack of restraint, living according to their desires rather than adhering to God’s Word. Jude’s description of these heretics is meant to alert the body of Christ to be aware of such influences and to earnestly contend for the faith that has been once and for all delivered to the saints, protecting the integrity of the church from corruption.