The Lord’s supper is a meal of peace and provision. Not only do we commune by eating His food, we must eat His flesh to live. Jesus said,
I am the bread of life. Your fathers ate the manna in the wilderness, and they died. This is the bread that comes down from heaven, so that one may eat of it and not die. I am the living bread that came down from heaven. If anyone eats of this bread, he will live forever. And the bread that I will give for the life of the world is my flesh.” (John 6:48–51)
This connection is so close that it’s disagreeable.
The Jews then disputed among themselves, saying, “How can this man give us his flesh to eat?” So Jesus said to them, “Truly, truly, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you.” (John 6:52–53)
As the living Father sent me, and I live because of the Father, so whoever feeds on me, he also will live because of me. This is the bread that came down from heaven, not like the bread the fathers ate, and died. Whoever feeds on this bread will live forever.” (John 6:57–58)
The imagery is God’s miraculous supply of manna to the Israelites. Of course, the imagery also fits with the peace offering. The sacrifice was killed, cut, cooked, then consumed. Jesus Himself prophecies that He would be killed and that He must be consumed. Without identifying with Him by consuming Him we have no life.
That’s how serious God is about being with us. He sent His own Son to take on flesh so that we could live forever with the living Father, with the Son who lives (6:57), and with the Spirit who gives life (6:63). God wants fellowship with us, so we must eat Christ’s body and drink His blood. That’s true life and true communion.