You are not to eat anything leavened; eat unleavened bread in all your homes."

Matthew 13:33
He told them still another parable: "The kingdom of heaven is like leaven that a woman took and mixed into three measures of flour, until all of it was leavened."

Exodus 12:19
For seven days there must be no leaven found in your houses. If anyone eats something leavened, that person, whether a foreigner or native of the land, must be cut off from the congregation of Israel.

Exodus 12:21
Then Moses summoned all the elders of Israel and told them, "Go at once and select for yourselves a lamb for each family, and slaughter the Passover lamb.

You shall eat nothing leavened; in all your habitations shall you eat unleavened bread.