Text: 1 Corinthians 5:6-8
Long ago, when our God was about to lead the children of Israel up out of slavery in Egypt, He gave them the Passover meal. God instructed them that, on the night before they would leave Egypt, they were to take a young unblemished male lamb and slaughter it. Then, they were to take the blood of that lamb and use it to mark the doorposts of their houses. When the Angel of Death came that night to strike down the firstborn of Egypt, He would see the blood marking the door and pass over those inside. In addition, the Israelites were throw out any leaven in their homes. For one whole week they were not to eat any leavened thing. This lead to the Passover also being called the Feast of Unleavened Bread.
St. Paul uses these things as an illustration in our text. The Passover pointed ahead to and is fulfilled in the suffering of Christ. Jesus Christ, true God and also true man, is the true Passover Lamb. Three days ago, He was sacrificed for all human sin. God the Father handed Him over into death – even, He who had no sin. With His dying breath, Jesus uttered, “It is finished.” The sacrifice for all the sins of the world had been made. Jesus died. Our Passover Lamb was sacrificed. And, now, He has been raised. Christ died, and now He is raised again to never die again. Death could not hold Him. Just as the Passover Lamb pointed ahead to Christ, so the casting out of leaven pointed ahead to our new life in Him. Since Christ our Passover Lamb has been sacrificed, and He has freed us from the guilt of our sin, St. Paul encourages us to cast out the old leaven of malice and wickedness so that we may celebrate the Feast in sincerity and truth.
St. Paul wrote to the Corinthians in the first part of our text, “Your boasting is not good. Do you not know that a little leaven leavens the whole lump?” With this simple proverb, St. Paul admonished the congregation to cease from their sinful behavior, behavior which belonged to their former manner of life – the life that they seemingly had before they were in Christ. Through St. Paul, the Corinthians heard the good news of Jesus Christ. They heard and believed that Jesus Christ, true God begotten of the Father before all time, became true man. He became man to fulfill God’s Law, to bear our sins, and to suffer and die to redeem the whole world. By His death, Christ atoned for all human sin and has freed us all from the guilt we deserve to bear.
The Corinthians heard and believed this, yet they acted as if they had not heard. Or, at least, they used the freedom they received in Christ as liberty to continue in sin. St. Paul’s first letter to the Corinthians covers many such situations – eating food sacrificed to idols, lawsuits among believers, drunkenness at church gatherings, and improper sexual relationships. The Corinthians not only did these things, but they boasted in them. They held, that since they had been forgiven in Christ, their present manner of living held no bearing on their future destination. In practice, their new life in Christ was no different from their former way of living. “Your boasting is not good,” St. Paul said. A little leaven leavens the whole lump. A little sin spreads into the whole group.
Like the Corinthians, we also have heard the Good News that we are free in Christ. By Christ’s death, our sins have been forgiven. And yet, like the Corinthians, we have used the freedom from sin as a liberty to sin. When we have fallen into sin, we have excused ourselves. We have lived to seek our own pleasures and satisfy our own desires. We have applied the Ten Commandments heavy-handedly toward others while turning a blind eye to our own sin. We have denied that we are sinners and acted as if we had no sin. We have continued to live in sin and presumed upon God’s grace. And, all of this, while we’ve called ourselves Christians. Our boasting is not good. St. Paul continued by saying, “Cleanse out the old leaven that you may be a new lump, as you really are unleavened.”
St. Paul encouraged the Corinthians and us to cast out and be cleansed of the old leaven of sin because, by Christ’s death we have been truly made “unleavened.” St. Paul said, “Cleanse out the old leaven…as you really are unleavened. For Christ, our Passover lamb, has been sacrificed.” As we said a few moments ago, at the Passover, the Israelites were to take an unblemished male lamb and sacrifice it. They would then take the blood to mark the doorposts of their homes, and death would spare those inside. Christ is the Passover lamb. He is the unblemished Lamb of God who takes way the sin of the world. Though He had no sin, He was made to be sin for us. In Him, God was reconciling the world to Himself. Christ is the Passover lamb, and His blood now marks our doors; it marks us.
By His death, Jesus Christ made full atonement for the sin of the world. All of our sin, all of our guilt, all of our temptations, all of our lies, all of our self-centeredness – these things He paid for with His own precious blood. And by His blood, death has passed over us. By His death, our debt is paid and by His rising again, death passes us over. The old leaven of malice and evil has been purged from the houses of our hearts, and we have been made unleavened. That means that, in God’s eyes – by faith in Christ – we have been made to be without sin. By the sacrifice of the true Passover Lamb, we are cleansed from all guilt and blame. We are unleavened.
“Let us therefore celebrate the festival, not with the old leaven, the leaven of malice and evil, but with the unleavened bread of sincerity and truth.” As Christians in this world, we live with feet in two kingdoms. We have been brought into the kingdom of God through the washing of Holy Baptism and by the gift of faith; yet, we remain in the kingdom of the world. Before God we are righteous saints, freed from the guilt of our sins. Yet, as we remain this flesh, we are sinners. As we remain both saint and sinner, our lives are imperfect. Though we know and have heard the things we should do, we fail to do them. The Corinthians used their freedom in the Gospel as liberty to sin, and we have, too.
Let us celebrate the festival in sincerity and truth, St. Paul said, for our Passover Lamb has been sacrificed. Christ, the true Passover Lamb, suffered and died for the sins of the world. And, what is more, He has been raised. Christ, our God, lives and reigns forever. By faith in Him, we, too, will rise from the dead to live in eternity. And, that eternity has already begun. In the Holy Supper, we receive a glimpse of the heavenly feast, and the lives we live now are the same lives that will continue beyond the grave. Therefore, St. Paul said, let us celebrate by living in sincerity and truth. Let us not lie but speak the truth. Let us not seek primarily our own good, but the good of others. Let us forgive those who sin against us, and seek their forgiveness when we sin against them. Let all filthy speech and actions be cleansed from our lives, even as the guilt of our sins has been removed from us.
When Mary Magdalene, Mary the mother of James, and Salome went to the tomb that Sunday morning, they did not find what they expected. They were expecting to find the body of Jesus. Instead, they were met by an angel who told them, “You seek Jesus of Nazareth, who was crucified. He has risen; He is not here.” Jesus Christ, who was crucified for our sin, is now raised from the dead. Death could not keep Him, and neither will it hold those who are in Christ. Christ our Passover Lamb has been sacrificed and we are free from sin and death. Let us therefore celebrate His feast in sincerity, love, and truth.
 1 Corinthians 5:6, English Standard Version.
 1 Cor. 5:7.
 1 Cor. 5:8.
 Mk. 16:6