Galatians 5:9
A little leaven leavens the whole mass.
1 Corinthians 15:33
Be not deceived: Evil communications corrupt good manners.
Matthew 16:6-12
And Jesus said to them: Take heed and be ware of the leaven of the Pharisees and Sadducees.
Matthew 23:33
Serpents, generation of vipers, how can you escape the condemnation of hell?
Mark 8:15
And he charged them, saying: Take heed, and beware of the leaven of the Pharisees, and of the leaven of Herod.
Luke 12:1
In the mean time, when myriads of the people had come together, so that they trod one upon another, he began to say to his disciples first of all: 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 flour, till the whole was leavened.
1 Corinthians 5:6-7
Your boasting is not good; know you not that a little leaven leavens the whole mass?
2 Timothy 2:17
and their word will eat as a gangrene: of whom are Hyrnenaeus and Philetus,