Galatians 5:9
A little leaven leavens the whole mass.
1 Corinthians 15:33
Be not deceived; evil companionships corrupt good morals.
Matthew 16:6-12
And Jesus said to them, Observe and beware of the leaven of the Pharisees and Sadducees.
Matthew 23:33
Serpents, offspring of vipers! How can you escape the judgment of hell?
Mark 8:15
And he charged them, saying, Observe and beware of the leaven of the Pharisees, and of the leaven of Herod.
Luke 12:1
AT that time, the multitude being assembled by ten thousands, so that they trod one on another, he said to his disciples, Beware, first, of the leaven of the Pharisees, which is hypocrisy;
Luke 13:21
It is like leaven which a woman took and hid in three sata [33 quarts] of flour, till the whole was leavened.
1 Corinthians 5:6-7
Your rejoicing is not good. Do you not know that a little leaven leavens the whole mass?
2 Timothy 2:17
and their word will eat like a gangrene; of whom are Hymenaeus and Philetus,