A LITTLE LEAVEN LEAVENS THE WHOLE LUMP

March 15 - 1 Corinthians 5-6

Your glorying is not good. Do you not know that a little leaven leavens the whole lump? 7 Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened. For indeed Christ, our Passover, was sacrificed for us. 8 Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth. (1 Corinthians 5:6-8)

These verses come in the context of a serious scandal in the church. An immoral relationship between a church member and his stepmother was occurring and the church was tolerating it. Their attitude was to be proud of their tolerance of unchecked sin. Paul uses the imagery of leaven and the Jewish Passover feast to teach that unchecked sin corrupts the entire body of believers. His message emphasizes the necessity of holiness, the purifying work of Christ, and the call for believers to live transformed lives.

Paul begins in verse 6 by saying, “Your glorying is not good. Do you not know that a little leaven leavens the whole lump?” The Corinthians were boasting about their tolerance or perhaps their perceived spiritual maturity, but Paul rebukes them. Instead of grieving over sin in their midst, they were proud. Paul illustrates the danger of their attitude by using the metaphor of leaven, or yeast. In biblical symbolism, leaven often represents the permeating influence of sin or corruption. Just as a small amount of yeast spreads throughout an entire batch of dough, a single tolerated sin can gradually affect the entire church. Paul’s warning teaches that sin is never isolated; it spreads and influences others if left unchecked.

In verse 7 Paul continues, “Therefore purge out the old leaven, that you may be a new lump, since you truly are unleavened.” Here Paul calls the church to remove the corrupting influence from among them. The language echoes the Old Testament practice during Passover when Jewish families removed all leaven from their homes before celebrating the feast (Exodus 12:15). This act symbolized purification and separation from the old life in Egypt. Paul applies this imagery to the church, urging believers to remove sinful influences from their fellowship. The command to “purge out the old leaven” points to church discipline and the necessity of maintaining moral purity within the body of Christ.

Paul then provides the theological foundation for this command: “For indeed Christ, our Passover, was sacrificed for us.” Just like the Passover lamb was sacrificed in Israel to spare the people from judgment, Jesus Christ was sacrificed for the salvation of humanity. His death fulfilled the Passover symbolism by providing the ultimate deliverance from sin and God’s wrath. Because Christ has already been sacrificed, believers have been set apart as God’s redeemed people. Their identity has changed. They are no longer defined by the “old leaven” of sin but by the cleansing work of Christ. Therefore, their conduct should reflect this new identity.

In verse 8 Paul draws a practical conclusion: “Therefore let us keep the feast, not with old leaven, nor with the leaven of malice and wickedness, but with the unleavened bread of sincerity and truth.” Paul is not commanding Christians to observe the literal Jewish feast but is using the imagery to describe the Christian life. The believer’s entire life becomes a continual celebration of redemption. However, such a celebration must be marked by purity and integrity.

Paul identifies the “old leaven” specifically as malice and wickedness. These terms describe attitudes and behaviors that destroy fellowship and dishonor God. Malice refers to evil intent or hostility toward others, while wickedness refers to moral corruption and sinful conduct. In contrast, believers are called to live with the “unleavened bread of sincerity and truth.” Sincerity implies purity of heart and genuine devotion to God, while truth points to alignment with God’s revealed word.

These verses reveal a crucial principle for the church: redemption in Christ demands holiness in life. The sacrifice of Christ was not merely to secure forgiveness but also to transform believers into a holy people. When the church tolerates sin, it undermines the very work Christ accomplished on the cross. Just as leaven spreads silently through dough, sin spreads through attitudes, influence, and example within the community of faith.

At the same time, Paul’s message is not merely negative or disciplinary. It is deeply rooted in the gospel. The command to remove the old leaven flows from the reality that Christ has already been sacrificed as the Passover Lamb. The church pursues purity not to earn salvation but because salvation has already been accomplished through Christ’s atoning work.

Ultimately, the apostle Paul calls believers to remember who they are in Christ and to live accordingly. The church is a redeemed community purchased by the blood of the Passover Lamb. Therefore, it must reject the corruption of sin and cultivate lives marked by sincerity, truth, and holiness. In doing so, the church reflects the transforming power of the gospel and honors the sacrifice of Christ who redeemed it.