1 Corinthians 11:27

When he had given thanks, he broke it and said, “Take, eat. This is my body, which is broken for you. Do this in memory of me.”

In the same way he also took the cup after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink, in memory of me.”

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 in an unworthy way eats and drinks judgment to himself if he doesn’t discern the Lord’s body.

For this cause many among you are weak and sickly, and not a few sleep.