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1 Corinthians 5:6-8
Your glorying is not good. Do you not know that a little leaven leavens the whole lump? Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us. Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.
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Matthew 16:6
Then Jesus said to them, "Take heed and beware of the leaven of the Pharisees and the Sadducees."
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Matthew 16:11-12
How is it you do not understand that I did not speak to you concerning bread?—but to beware of the leaven of the Pharisees and Sadducees." Then they understood that He did not tell them to beware of the leaven of bread, but of the doctrine of the Pharisees and Sadducees.
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Leviticus 2:11
"No grain offering which you bring to the LORD shall be made with leaven, for you shall burn no leaven nor any honey in any offering to the LORD made by fire.
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Luke 12:1
In the meantime, when an innumerable multitude of people had gathered together, so that they trampled one another, He began to say to His disciples first of all, "Beware of the leaven of the Pharisees, which is hypocrisy.
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Galatians 5:9
A little leaven leavens the whole lump.
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Mark 8:15
Then He charged them, saying, 'Take heed, beware of the leaven of the Pharisees and the leaven of Herod.'
For more scripture references, please see Bible verses for Leaven as a Type of Sin
Resources
Leavening: The Types
Sermon by John W. RitenbaughDuring the Days of Unleavened Bread, God instructs us to remove leaven from our homes as a powerful object lesson. Leaven represents sin, a symbol of what brings us into spiritual bondage. Just as leaven is ingested and becomes part of us, so too are the false teachings and doctrines we innocently absorb from the world, often …
The Offerings of Leviticus (Part Seven): The Sin and Trespass Offerings
'Personal' from John W. RitenbaughSin and human nature affect everyone in society—from king to commoner—but God has covered sin from every angle in the sacrifice of His Son, fulfilling Leviticus 4-5.
A Little Leaven
Sermonette by John W. RitenbaughOur individual sins (committed in our thoughts, words, and behaviors) are never isolated, but sadly influence every other member of the congregation.

Why We Must Put Out Leaven
Article by Earl L. HennWhy must we put leaven out, yet we do not have to circumcise our baby boys? Is deleavening 'Old Covenant'?
The Reason for Unleavened Bread
Sermonette by David C. GrabbeThe Feast of Unleavened Bread signifies far more than the avoidance of leavening. Our focus needs to be on God's management of the process of deliverance.
The Parables of Matthew 13 (Part Five): The Parable of the Leaven
Bible Study by Martin G. CollinsMost commentators see this parable as a positive message of the growth of the church. However, deeper study shows that they have it exactly backward!

Unleavened Bread Basics
Sermon by David C. GrabbeThe Feast of Unleavened Bread memorializes God's deliverance from the environment of sin rather than our coming out of sin. Christ embodies sincerity and truth.
Sincerity and Truth (Part Two)
Sermon by Richard T. RitenbaughIn contrast to the world's embracing of fraud and deceit, God's called-out ones are obligated to eat the bread of sincerity and truth all our lives.
For more resources, please see the library topic for Leaven as a Type of Sin