What does the Bible say about the dangers of false teachers?

In the Epistle of Jude, we are cautioned about false teachers who secretly infiltrate the church, transforming the grace of God into licentiousness and denying the sovereignty of our Lord Jesus Christ (Jude 8-10). These deceivers manifest characteristics of rebellion, much like the inhabitants of Sodom and Gomorrah, and are described as those who blaspheme whatever they do not understand. False teachers live not by the truth of Scripture but by their own desires and dreams, leading themselves and others astray. Jude calls us to contend earnestly for the faith once delivered to the saints, highlighting the necessity of vigilance and reliance on God’s Word to guard against such infiltration.