'Beware' in the Bible

"Beware of false prophets who come to you in sheep's clothing but inwardly are savage wolves.

Jesus told them, "Watch out! Beware of the yeast of the Pharisees and Sadducees!"

How can you fail to understand that I wasn't talking to you about bread? Beware of the yeast of the Pharisees and Sadducees!"

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