Matthew 6:1; Matthew 7:15; Matthew 10:17; Matthew 16:6; Matthew 16:11-12
"Beware of practicing your righteousness before men to be noticed by them; otherwise you have no reward with your Father who is in heaven.
"Beware of the false prophets, who come to you in sheep's clothing, but inwardly are ravenous wolves.
"But beware of men, for they will hand you over to the courts and scourge you in their synagogues;
And Jesus said to them, "Watch out and beware of the leaven of the Pharisees and Sadducees."
"How is it that you do not understand that I did not speak to you concerning 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.