'Leaven' in the Bible
He spoke another parable to them: The kingdom of the heavens is like leaven, which a woman took and hid in three measures of meal until it had been all leavened.
And Jesus said to them, See and beware of the leaven of the Pharisees and Sadducees.
How do ye not understand that it was not concerning bread I said to you, Beware of the leaven of the Pharisees and Sadducees?
Then they comprehended that he did not speak of being beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.
And he charged them, saying, Take heed, beware of the leaven of the Pharisees and of the leaven of Herod.
In those times, the myriads of the crowd being gathered together, so that they trod one on another, he began to say to his disciples first, Beware of the leaven of the Pharisees, which is hypocrisy;
It is like leaven, which a woman took and hid in three measures of meal until the whole was leavened.
Your boasting is not good. Do ye not know that a little leaven leavens the whole lump?
Purge out the old leaven, that ye may be a new lump, according as ye are unleavened. For also our passover, Christ, has been sacrificed;
so that let us celebrate the feast, not with old leaven, nor with leaven of malice and wickedness, but with unleavened bread of sincerity and truth.