1 Corinthians 11:23-31

For I received from the Lord what I also passed on to you, that the Lord Jesus, on the night in which he was betrayed, took bread, and after he had given thanks, he broke it and said, “This is my body which is for you. Do this in remembrance of me.” Likewise also the cup, after they had eaten, 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 this cup, you proclaim the Lord’s death until he comes. So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of the body and the blood of the Lord. But let a person examine himself, and in this way let him eat from the bread and let him drink from the cup. For the one who eats and drinks, if he does not recognize the body, eats and drinks judgment against himself. Because of this, many are weak and sick among you, and quite a few have died. But if we were evaluating ourselves, we would not be judged.