Matthew 16:11-12

16:11 How could you not understand that I was not speaking to you about bread? But beware of the yeast of the Pharisees and Sadducees!” 16:12 Then they understood that he had not told them to be on guard against the yeast in bread, but against the teaching of the Pharisees and Sadducees.

Mark 3:6

3:6 So the Pharisees went out immediately and began plotting with the Herodians, as to how they could assassinate him.

Mark 8:15

8:15 And Jesus ordered them, “Watch out! Beware of the yeast of the Pharisees and the yeast of Herod!”