Matthew 23:33
You snakes! You brood of vipers! How will you escape the sentence of hell?

Matthew 16:6-12
"Watch out!" Jesus told them. "Beware of the yeast of the Pharisees and Sadducees." . . .

Mark 8:15
"Watch out!" He cautioned them. "Beware of the yeast 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 yeast of the Pharisees, which is hypocrisy.

Luke 13:21
It is like yeast that a woman took and mixed into three measures of flour until all of it was leavened."

1 Corinthians 5:6, 7
Your boasting is not good. Do you not know that a little yeast leavens the whole batch of dough? . . .

1 Corinthians 15:33
Do not be deceived: "Bad company corrupts good character."

2 Timothy 2:17
and the talk of such men will spread like gangrene. Among them are Hymenaeus and Philetus,