'Wolves' in the Bible

'But, take heed of the false prophets, who come unto you in sheep's clothing, and inwardly are ravening wolves.

'Lo, I do send you forth as sheep in the midst of wolves, be ye therefore wise as the serpents, and simple as the doves.

'Go away; lo, I send you forth as lambs in the midst of wolves;

for I have known this, that there shall enter in, after my departing, grievous wolves unto you, not sparing the flock,