'Beware' in the Bible

"Beware of false prophets who come to you in sheep's clothing, but inside are ravenous wolves.

But beware of people, because they will hand you over to councils, and they will flog you in their synagogues.

And Jesus said to them, "Watch out for and beware of the leaven of the Pharisees and Sadducees!"

How do you not understand that I did not speak to you about bread? But beware of the leaven of the Pharisees and Sadducees!"

Then they understood that he did not say to beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees.