Q. 107. What is the Lord’s Supper?
A. The Lord’s Supper is a holy ordinance, wherein, by giving and receiving bread and wine, according to Christ’s appointment, His death is showed forth, and the worthy receivers are, not after a corporeal and carnal manner, but by faith, made partakers of His body and blood, with all His benefits, to their spiritual nourishment, and growth in grace.
For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, and when he had given thanks, he broke it, and said, “This is my body which is for you. Do this in remembrance of me.” In the same way also he took the cup, after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.” For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes.
1 Corinthians 11:23-26
The cup of blessing that we bless, is it not a participation in the blood of Christ? The bread that we break, is it not a participation in the body of Christ?
1 Corinthians 10:16