Jud 1:10-16 BSB 10 These men, however, slander what they do not understand, and like irrational animals, they will be destroyed by the things they do instinctively. 11 Woe to them! They have traveled the path of Cain; they have rushed headlong into the error of Balaam; they have perished in Korah’s rebellion. 12 These men are hidden reefs in your love feasts, shamelessly feasting with you but shepherding only themselves. They are clouds without water, carried along by the wind; fruitless trees in autumn, twice dead after being uprooted. 13 They are wild waves of the sea, foaming up their own shame; wandering stars, for whom blackest darkness has been reserved forever. 14 Enoch, the seventh from Adam, also prophesied about them: “Behold, the Lord is coming with myriads of His holy ones 15 to execute judgment on everyone, and to convict all the ungodly of every ungodly act of wickedness and every harsh word spoken against Him by ungodly sinners.” 16 These men are discontented grumblers, following after their own lusts; their mouths spew arrogance; they flatter others for their own advantage.

Beware of "teachers".

Mat 5:19 BSB So then, whoever breaks one of the least of these commandments and teaches others to do likewise will be called least in the kingdom of heaven; but whoever practices and teaches them will be called great in the kingdom of heaven.

Test EVERYTHING!