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Leaven

Yeast used as a metaphor by Jesus for subtle, invisible corruption that spreads through a whole system; used in Mark 8 to warn against the corrupting religious influence of the Pharisees and the political compromise of Herod

lightbulbYeast — tiny amount, huge effect. Jesus used it as a metaphor for how sin (or the Kingdom) spreads

6 mentions across 4 books

Yeast that makes bread rise. Symbolically represents sin's pervasive spread — 'a little leaven leavens the whole lump' (Galatians 5:9). Israel removed all leaven during Passover. Jesus warned against 'the leaven of the Pharisees' (Matthew 16:6).

Used In

exodus

The Feast of Unleavened BreadExodus 12:14-20

Leaven is introduced here as a symbolic element requiring total removal from Israelite homes — the narrator unpacks the spiritual logic: it represents the old corrupted life that cannot be carried into God's new chapter.

The "Never Forget" SpeechExodus 13:3-10

Leaven is banned here not for moral reasons but as a memorial — its absence for seven days reenacts the hasty, no-time-to-wait departure from Egypt, embedding the exodus urgency into annual practice.

1 corinthians

A Little Leaven Ruins Everything1 Corinthians 5:6-8

Leaven functions here as Paul's metaphor for unrepentant sin tolerated within the community — a small amount quietly spreads until it corrupts the entire batch.

leviticus

No Yeast, No Honey, Always SaltLeviticus 2:11-13

Leaven is prohibited here from all grain offerings brought to the altar — its first mention in this passage establishes it as something that corrupts and disqualifies, representing impurity before God.

luke

The Pharisees Are SusLuke 12:1-3

Leaven is Jesus' metaphor for hypocrisy at this moment — just as yeast quietly works through an entire batch of dough, a fake spiritual persona invisibly corrupts everything it touches.

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