St. Paul's First Letter to the Corinthians 5:6-8
BRETHREN, a little leaven leavens the whole lump. Cleanse out the old leaven that you may be a new lump, as you really are unleavened. For Christ, our paschal lamb, has been sacrificed. 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. (Galatians 3.13-14) Christ redeemed us from the curse of the law, having become a curse for us - for it is written, "Cursed be everyone who hangs on a tree" - that in Christ Jesus the blessing of Abraham might come upon the Gentiles, that we might receive the promise of the Spirit through faith.