'Beware' in the Bible

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

But beware of men: for they will deliver you up to councils, and in theirs synagogues they will scourge you;

And Jesus said unto them, Take heed and beware of the leaven of the Pharisees and Sadducees.

How is it that ye do not perceive that I spake not to you concerning bread? But beware of the leaven of the Pharisees and Sadducees.

Then understood they that he bade them not beware of the leaven of bread, but of the teaching of the Pharisees and Sadducees.