7 Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our Passover lamb, has been sacrificed. 8 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. ~ 1 Corinthians 5:7-8
The Israelites prepared for the Passover by cleansing the leaven out of their homes. This was a foreshadowing of the good and better things that have now come. Jesus, our Passover over lamb, has been sacrificed, and we overcome the world and its sin through Him.
No longer is it just a physical act; now, this action is also spiritual. We remove the spiritual leaven from our lives. The sins, false teachings and beliefs, strongholds, wrong relationships, etc. are all broken and cleansed from our lives through Jesus. This may not happen overnight, but it will happen through perseverance in Christ.
No longer does our sin have to separate us from God; now, through Christ, we are cleansed of our sin and forgiven. We are now reconciled to God. We are now a new creation being molded into the very image of Christ.
Peace. Love. Go Forth and Clean Some Leaven.