What does leaven represent in the Bible?

Leaven is often used biblically to signify influences that corrupt or puff up a person with pride, which can lead to spiritual decay. Paul cautioned the Corinthians, stating that a little leaven leavens the whole lump (1 Corinthians 5:6), warning against the dangers of allowing sin, pride, or false teaching to infiltrate the church. The act of purging leaven during the feast symbolizes the need for Christians to recognize and eliminate any sources of spiritual corruption within their lives and the church. By maintaining an unleavened state, believers can focus on Christ—our Passover lamb—who provides true righteousness and communion with God.