"Roman Catholic Communion"
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This refers to the taking of bread and wine during the celebration of Mass.

In a ceremony called the Eucharist, the bread and wine are seen to become the body and blood of Christ.

The ceremony occurs in the Gospel of John, where Jesus says 'Whoever eats my flesh and drinks my blood remains in me and I in him' and is believed to have originated at the Last Supper, Jesus’ final meal with his disciples.