>>111

Yes we still celebrate Passover....as Easter (or Pascha if you're Orthodox.) In the context of the verse you cite, he's clearly using leaven as a metaphor for the Corinthians needing to spiritually and morally clean up their corrupted church at the time, as well as faith in Christ making said members 'unleavened' (i.e. spiritually clean.) Once again, the original Passover, with eating only unleavened bread for a straight week or else you suffer the penalty of being physically and spiritually cut off from the tribe permanently, is but a shadow and hint of what was to come in the New Covenant: spiritual cleanliness for humanity on a level beyond mere surface ritual.