How should Christians understand leaven in the context of the Church?

Leaven is a biblical metaphor for sin, hypocrisy, and false righteousness. In Exodus 12, the Israelites were commanded to avoid leaven during the Passover, symbolizing the need for purity and sincerity in their worship. In the context of the Church, leaven represents any belief or practice that deviates from the core truths of the gospel. The presence of leaven signifies a reliance on self-righteousness and the traditions of man rather than on God's grace and truth. Thus, the true Church must strive to eliminate any leaven in its midst, focusing instead on the sincerity of worship and the grace found in Christ.