With cakes of leavened bread he shall offer his offering in the sacrifice of thanksgiving of his peace.
Ye shall bring out of your habitations two wave loaves of two-tenth deals; they shall be of fine flour, they shall be baked with leaven, they are the firstfruits unto the LORD.
In the offering of the firstfruits ye shall offer them unto the LORD, but they shall not be offered on the altar for an acceptable aroma.
and offer a sacrifice of praise with leaven, and proclaim and publish the free will offerings for this is the way you like it, O ye sons of Israel, said the Lord GOD.
They are all adulterers as an oven heated by the baker who shall cease from waking after he has kneaded the dough until it is leavened.
It is like leaven which a woman took and hid in three measures of meal until the whole was leavened.
Then Jesus said unto them, Take heed and keep yourselves from the leaven of the Pharisees and of the Sadducees.
How is it that ye do not understand that I did not speak to you concerning bread that ye should keep yourselves from the leaven of the Pharisees and of the Sadducees?
And he commanded them, saying, Take heed, beware of the leaven of the Pharisees and of the leaven of Herod.
In the meantime, when there were gathered together an innumerable multitude of people, insomuch that they trode one upon another, he began to say unto his disciples first of all, Beware ye of the leaven of the Pharisees, which is hypocrisy.
Then they understood that he bade them not to keep themselves from the leaven of bread, but from the doctrine of the Pharisees and of the Sadducees.
1 Corinthians 5:8
therefore let us celebrate the feast, not in the old leaven, neither in the leaven of malice and wickedness, but in the unleavened bread of sincerity and truth.
He spoke another parable unto them: The kingdom of the heavens is like unto leaven, which a woman took and hid in three measures of meal until the whole was leavened.
1 Corinthians 5:6
Your glorying is not good. Know ye not that a little leaven leavens the whole lump?