1 Corinthians 5:7-8

Then get rid of the old leaven, so that you may be like a new lump, as you are now unleavened. For our Paschal Lamb has already been sacrificed, Christ himself.

Treasury of Scripture Knowledge

Summary

Thou shalt not offer the blood of my sacrifice with leaven; neither shall the sacrifice of the feast of the passover be left unto the morning.

Bible References

Leaven

1 Corinthians 5:7
Then get rid of the old leaven, so that you may be like a new lump, as you are now unleavened. For our Paschal Lamb has already been sacrificed, Christ himself.