1 Corinthians 11:23-29

For I have received from the Lord what I have also delivered to you: that the Lord Jesus, on the same night that he was handed over, took bread, and giving thanks, he broke it, and said: "Take and eat. This is my body, which shall be given up for you. Do this in remembrance of me." Similarly also, the cup, after he had eaten supper, saying: "This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me." For whenever you eat this bread and drink this cup, you proclaim the death of the Lord, until he returns. And so, whoever eats this bread, or drinks from the cup of the Lord, unworthily, shall be liable of the body and blood of the Lord. But let a man examine himself, and, in this way, let him eat from that bread, and drink from that cup. For whoever eats and drinks unworthily, eats and drinks a sentence against himself, not discerning it to be the body of the Lord.