Matthew 16:12
Then they understood that he was warning them not against yeast but against the teaching of the Pharisees and Sadducees.
Luke 12:1
Meanwhile as the people gathered in thousands, until they actually trod on one another, he proceeded to say to his disciples first of all, "Beware of the yeast of the Pharisees, that is, hypocrisy.
Acts 12:3
and when he saw that this gratified the Jews, he proceeded to arrest Peter too, at the time of the festival of Unleavened Bread.
1 Corinthians 5:7-8
You must clean out the old yeast and become fresh dough, free from the old as you really are. For our Passover lamb is already sacrificed; it is Christ himself.
Galatians 5:12
I wish the people who are upsetting you would go on, and have themselves emasculated!