Jude 1:11-12

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