1 Corinthians 5:7-8

So remove every trace of your “leaven” of compromise with sin so that you might become new and pure again. For indeed, you are clean because Christ, our Passover Lamb, has been sacrificed for us. So now we can celebrate our continual feast, not with the old “leaven,” the yeast of wickedness or bitterness, but we will feast on the freshly baked bread of innocence and holiness.