Jude 1:4, 10-12

For certain people have crept in unnoticed [just as if they were sneaking in by a side door]. They are ungodly persons whose condemnation was predicted long ago, for they distort the grace of our God into decadence and immoral freedom [viewing it as an opportunity to do whatever they want], and deny and disown our only Master and Lord, Jesus Christ.

But these men sneer at anything which they do not understand; and whatever they do know by [mere] instinct, like unreasoning and irrational beasts—by these things they are destroyed. Woe to them! For they have gone the [defiant] way of Cain, and for profit they have run headlong into the error of Balaam, and perished in the rebellion of [mutinous] Korah. [Gen 4:3-8; Num 16:22-24; 2 Pet 2:15] These men are hidden reefs [elements of great danger to others] in your love feasts when they feast together with you without fear, looking after [only] themselves; [they are like] clouds without water, swept along by the winds; autumn trees without fruit, doubly dead, uprooted and lifeless