1 Corinthians 10:16

The cup of blessing [of wine at the Lord's Supper] upon which we ask [God's] blessing, does it not mean [that in drinking it] we participate in and share a fellowship (a communion) in the blood of Christ (the Messiah)? The bread which we break, does it not mean [that in eating it] we participate in and share a fellowship (a communion) in the body of Christ?