Galatians 5:9
A little leaven leavens the whole batch of dough.
1 Corinthians 15:33
Do not be deceived! "Bad company corrupts good morals."
Matthew 16:6-12
And Jesus said to them, "Watch out for and beware of the leaven of the Pharisees and Sadducees!"
Matthew 23:33
Serpents! Offspring of vipers! How will you escape from the condemnation to hell?
Mark 8:15
And he ordered them, saying, "Watch out! Beware of the leaven of the Pharisees and the leaven of Herod!"
Luke 12:1
During {this time} [when] a crowd of many thousands had gathered together, so that they were trampling one another, he began to say to his disciples first, "Beware for yourselves of the leaven of the Pharisees, which is hypocrisy.
Luke 13:21
It is like yeast that a woman took [and] hid in three measures of wheat flour until the whole [batch] was leavened."
1 Corinthians 5:6-7
Your boasting [is] not good. Do you not know that a little leaven leavens the whole batch of dough?
2 Timothy 2:17
and their message {will spread} like gangrene, among whom are Hymenaeus and Philetus,