How is it that you do not understand that I was not speaking to you about [physical] bread? But [rather I meant] watch out for the yeast [i.e., the influence] of the Pharisees and Sadducees.”
But when he saw many of the Pharisees and Sadducees coming to be immersed, John said to them, “You children of snakes, who warned you to run away from the coming wrath [of God]?
Then Jesus ordered them, saying, “Pay attention and watch out for the leavening [effect] of the Pharisees and Herod.” [Note: By “Herod” is probably meant the Herodians, who were a party favorable to King Herod and, along with the Pharisees and Sadducees, were out to get Jesus. See Matt. 16:6].
About this time, while a crowd of many thousands had assembled, [so large that] people were trampling on one another, Jesus first began telling His disciples, “Watch out for the leavening [effect] of the Pharisees, which is hypocrisy.
And [then] He said to them, “Be careful and guard yourselves against [practicing] all forms of greed, for a person’s life does not consist of having a lot of possessions.”