...is that Jesus did the same at the Last Supper.
When we participate in the
Eucharist at Mass we participate in that original Eucharist at Jesus'
Last Supper and in the new Passover (which Jesus was celebrating the
night before he died).
Less obvious is the callback to Genesis 14:18 with Melchizedek offering bread and wine. We wouldn't
give this much thought except Psalm 110 says the future messiah will be
a priest forever in the line of Melchizedek. At the time of the psalm
the priests were in the line of Aaron and offered mostly animal
sacrifices. This psalm foretells a new priest who will do things
The letter to the Hebrews again draws the
comparison to Melchizedek and declares Christ the final high priest who
offers himself once for all instead of again and again.
participate in the Eucharist we use bread and wine because Jesus did,
because the Passover did, and because the new priesthood Jesus founded
was foretold to.
This is yet another reason Catholics only use bread and wine for Communion.