'Wolves' in the Bible

“Beware of false prophets who come to you in sheep’s clothing but inwardly are ravaging wolves.

“Look, I’m sending you out like sheep among wolves. Therefore be as shrewd as serpents and as harmless as doves.

Now go; I’m sending you out like lambs among wolves.

I know that after my departure savage wolves will come in among you, not sparing the flock.