Then they understood that he had told them to be on their guard, not against the leaven of bread, but against the teaching of the Pharisees and Sadducees.
When, however, John saw many of the Pharisees and Sadducees coming to receive his baptism, he said to them: "You brood of vipers! Who has prompted you to seek refuge from the coming judgment?
Meanwhile the people had gathered in thousands, so that they trod upon one another, when Jesus, addressing himself to his disciples, began by saying to them: "Be on your guard against the leaven--that is, the hypocrisy--of the Pharisees.
And then he added: "Take care to keep yourselves free from every form of covetousness; for even in the height of his prosperity a man's true Life does not depend on what he has."