Matthew 16:12
Then they understood, that he did not bid them beware of the leaven of bread, but of the doctrine of the Pharisees and Saducees.
Luke 12:1
In the mean time, an innumerable multitude being gathered together, so that they trod one upon another, he said to his disciples first, Beware of the leaven of the Pharisees, which is hypocrisy.
Acts 12:3
And perceiving it pleased the Jews, he proceeded to take Peter also.
1 Corinthians 5:7-8
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened; for our passover is slain for us, even Christ:
Galatians 5:12
Then is the offence of the cross ceased. I would they were even cut off that trouble you.