'Wolves' in the Bible

“Beware of the false prophets, [teachers] who come to you dressed as sheep [appearing gentle and innocent], but inwardly are ravenous wolves.

“Listen carefully: I am sending you out like sheep among wolves; so be wise as serpents, and innocent as doves [have no self-serving agenda].

Go your way; listen carefully: I am sending you out like lambs among wolves.

I know that after I am gone, [false teachers like] ferocious wolves will come in among you, not sparing the flock;