I Corinthians 11:27

In the same way he also took the cup, after supper, saying, "This cup is the New Covenant in my bloo...

For as often as you eat this bread and drink this cup, you proclaim the Lord's death until he comes.

But let a man examine himself, and so let him eat of the bread, and drink of the cup.

For he who eats and drinks eats and drinks judgment to himself, if he does not discern the body.