Galatians 5:9

A little leaven [a slight inclination to error, or a few false teachers] leavens the whole batch [it perverts the concept of faith and misleads the church].

1 Corinthians 15:33

Do not be deceived: “Bad company corrupts good morals.”

Matthew 16:6-12

Jesus said to them, “Watch out and be on your guard against the leaven of the Pharisees and Sadducees.”

Matthew 23:33

You serpents, you spawn of vipers, how can you escape the penalty of hell?

Mark 8:15

Jesus repeatedly ordered them, saying, “Watch out! Beware of the leaven of the Pharisees and the leaven of Herod.”

In the meantime, after so many thousands of the people had gathered that they were stepping on one another, Jesus began speaking first of all to His disciples, “Be continually on your guard against the leaven of the Pharisees [that is, their pervasive, corrupting influence and teaching], which is hypocrisy [producing self-righteousness].

Luke 13:21

It is like leaven, which a woman took and hid in three peck measures of flour until it was all leavened.”

1 Corinthians 5:6-7

Your boasting [over the supposed spirituality of your church] is not good [indeed, it is vulgar and inappropriate]. Do you not know that [just] a little leaven ferments the whole batch [of dough, just as a little sin corrupts a person or an entire church]?

2 Timothy 2:17

and their teaching will spread like gangrene. So it is with Hymenaeus and Philetus,

Treasury of Scripture Knowledge

Summary