Galatians 5:9
A little leaven leavens all the lump.
1 Corinthians 15:33
Do not be deceived; evil companionships corrupt good habits.
Matthew 16:6-12
And Jesus said to them, Take heed, and beware the leaven of the Pharisees and of the Sadducees.
Matthew 23:33
Serpents! Offspring of vipers! How can you escape the condemnation of hell?
Mark 8:15
And He charged them, saying, Take heed! Beware of the leaven of the Pharisees and of the leaven of Herod.
Luke 12:1
In the meantime, when there had gathered together an innumerable crowd of people, so as to trample on one another, He began to say to His disciples first, Beware of the leaven of the Pharisees, which is hypocrisy.
Luke 13:21
It is like leaven which a woman took and hid in three measures of meal, until the whole was leavened.
1 Corinthians 5:6-7
Your boasting is not good. Do you not know that a little leaven leavens the whole lump?
2 Timothy 2:17
And their word will eat like a gangrene; among whom are Hymeneus and Philetus,