How do you not understand that I was not telling you about bread? But beware of the leaven of the Pharisees and Sadducees."

Matthew 3:7
But when John saw many of the Pharisees and Sadducees coming to his place of baptism, he said to them, "You brood of vipers, who warned you to flee from the coming wrath?

Matthew 16:1
Then the Pharisees and Sadducees came and tested Jesus by asking Him to show them a sign from heaven.

Matthew 16:6
"Watch out!" Jesus told them. "Beware of the leaven of the Pharisees and Sadducees."

Matthew 16:12
Then they understood that He was not telling them to beware of the leaven used in bread, but of the teaching of the Pharisees and Sadducees.

Mark 8:15
"Watch out!" He cautioned them. "Beware of the leaven of the Pharisees and of Herod."

Luke 12:1
In the meantime, a crowd of many thousands had gathered, so that they were trampling one another. Jesus began to speak first to His disciples: "Beware of the leaven of the Pharisees, which is hypocrisy.

How is it that you do not understand that I spoke it not to you concerning bread, that you should beware of the leaven of the Pharisees and of the Sadducees?