Exodus 13:7
Unleavened bread is to be eaten for seven days, and nothing leavened is to be seen among you, nor is leaven to be seen among you throughout your territory.
Exodus 12:19
For seven days leaven is not to be found in your houses. Indeed, any person who eats anything leavened, is to be cut off from the congregation of Israel, whether an alien or a native of the land.
Matthew 16:6
Jesus told them, "Watch out! Beware of the yeast of the Pharisees and Sadducees!"
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