'Beware' in the Bible

But beware of false prophets, which come to you in sheep's clothing, but within are ravening wolves.

But beware of men; for they will deliver you up to sanhedrims, and scourge you in their synagogues;

And Jesus said to them, See and beware of the leaven of the Pharisees and Sadducees.

How do ye not understand that it was not concerning bread I said to you, Beware of the leaven of the Pharisees and Sadducees?

Then they comprehended that he did not speak of being beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.