HH, Sir Godfrey Gregg D.Div
The nation of Israel practised the Passover in remembrance of how God passed over Israel and judged Egypt instead. During the original Passover, they sacrificed a lamb and wiped the blood on the doorpost so the Angel of the Lord would pass over them. They also got rid of all the yeast in their house. However, look at what Paul said about this festival:
Get rid of the old yeast that you may be a new batch without yeast—as you really are. For Christ, our Passover lamb has been sacrificed. Therefore let us keep the Festival, not with the old yeast, the yeast of malice and wickedness, but with bread without yeast, the bread of sincerity and truth (1 Corinthians 5:7–8).
Purge out therefore the old leaven, that ye may be a new lump, as ye are unleavened. For even Christ our passover is sacrificed for us: 8 Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.
In the Old Testament, Israel practised the Passover once a year, but figuratively we practice it every day. As we repent of sin and remove it from our lives, we are like the Jews getting rid of the yeast. Christ, our sacrificial lamb, died so that God’s wrath would pass over us and as an act of faith in him, we daily seek to get rid of our yeast—our sin. The Old Testament law was just a shadow of Christ.