Have you eaten the flesh of the Son of Man?
Now that is a provocative question, suggesting gory cannibalism. But this comes from Jesus, who regularly made provocative claims about himself.
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. 54 Whoever feeds on my flesh and drinks my blood has eternal life, and I will raise him up on the last day. For my flesh is true food, and my blood is true drink. Whoever feeds on my flesh and drinks my blood abides in me, and I in him (John 6:53-56).
Do these words and images refer to Communion of the Lord’s table? Jesus nowhere in this speech refers to the Lord’s Supper. He is talking about person’s exercising faith in himself and his work on the cross in order to obtain eternal life. However, though passage does not first and foremost refer to the Lord’s Supper, feeding on Christ by faith is precisely what we do in communion. Thus as D. A. Carson says, these words “do expose the true meaning of the Lord’s supper as clearly as any passage in Scripture.”
We eat of the Son of man by faith in Him. And we also continue to eat and drink of Him by Faith, when we partake of the Lord’s supper. In this holy remembrance of his broken body and shed blood the Holy Spirit nourishes and strengthen our faith unto eternal life.
He is the bread of life, therefore each must eat of this bread.