Jude 1:10-13, 16

But these men revile the things which they do not understand; and the things which they know by instinct, like unreasoning animals, by these things they are destroyed. Woe to them! For they have gone the way of Cain, and for pay they have rushed headlong into the error of Balaam, and perished in the rebellion of Korah. These are the men who are hidden reefs in your love feasts when they feast with you without fear, caring for themselves; clouds without water, carried along by winds; autumn trees without fruit, doubly dead, uprooted; wild waves of the sea, casting up their own shame like foam; wandering stars, for whom the black darkness has been reserved forever.

These are grumblers, finding fault, following after their own lusts; they speak arrogantly, flattering people for the sake of gaining an advantage.