1 Corinthians 5:7

Purge out-the old leaven; the apostle alludes to the Jewish custom of carefully putting away from their houses all leaven upon the approach of the feast of the passover. Leaven is in the Scriptures a common emblem for moral corruption. The old leaven which he exhorted them to put away was the remainder of their former wickedness, as seen in this incestuous person.

A new lump; fresh and unleavened; that is, pure from corruption.

As ye are unleavened; profess and are under peculiar obligations to be holy.

Christ our passover; the ground or reason why we are passed over, as the first-born of the Israelites were, Exodus 12:23, and not destroyed, is the death of Christ. As the Israelites were to put away all leaven before partaking of the paschal lamb, Exodus 12:15, which was the type of Christ, so the Corinthians were to put away all sin, that they might spiritually feed on Christ, the great antitype.