'Leaven' in the Bible
Seven days ye eat unleavened things; only -- in the first day ye cause leaven to cease out of your houses; for any one eating anything fermented from the first day till the seventh day, even that person hath been cut off from Israel.
seven days leaven is not found in your houses, for any one eating anything fermented -- that person hath been cut off from the company of Israel, among the sojourners or among the natives of the land;
unleavened things are eaten the seven days, and any thing fermented is not seen with thee; yea, leaven is not seen with thee in all thy border.
No present which ye bring near to Jehovah is made fermented, for with any leaven or any honey ye perfume no fire-offering to Jehovah.
and there is not seen with thee leaven in all thy border seven days, and there doth not remain of the flesh which thou dost sacrifice at evening on the first day till morning.
And perfume with leaven a thank-offering, And proclaim willing gifts, sound ye! For so ye have loved, O sons of Israel, An affirmation of the Lord Jehovah.
Another simile spake he to them: 'The reign of the heavens is like to leaven, which a woman having taken, hid in three measures of meal, till the whole was leavened.'
and Jesus said to them, 'Beware, and take heed of the leaven of the Pharisees and Sadducees;'
how do ye not understand that I did not speak to you of bread -- to take heed of the leaven of the Pharisees and Sadducees?'
Then they understood that he did not say to take heed of the leaven of the bread, but of the teaching, of the Pharisees and Sadducees.
and he was charging them, saying, 'Take heed, beware of the leaven of the Pharisees, and of the leaven of Herod,'
At which time the myriads of the multitude having been gathered together, so as to tread upon one another, he began to say unto his disciples, first, 'Take heed to yourselves of the leaven of the Pharisees, which is hypocrisy;
It is like leaven, which a woman, having taken, did hide in three measures of meal, till that all was leavened.'
Not good is your glorying; have ye not known that a little leaven the whole lump doth leaven?
cleanse out, therefore, the old leaven, that ye may be a new lump, according as ye are unleavened, for also our passover for us was sacrificed -- Christ,
so that we may keep the feast, not with old leaven, nor with the leaven of evil and wickedness, but with unleavened food of sincerity and truth.