1 Corinthians 11:23-28 NLT
For I pass on to you what I received from the Lord himself. On the night when he was betrayed, the Lord Jesus took some bread and gave thanks to God for it. Then he broke it in pieces and said, “This is my body, which is given for you. Do this in remembrance of me.” In the same way, he took the cup of wine after supper, saying, “This cup is the new covenant between God and his people—an agreement confirmed with my blood. Do this in remembrance of me as often as you drink it.” For every time you eat this bread and drink this cup, you are announcing the Lord’s death until he comes again.
So anyone who eats this bread or drinks this cup of the Lord unworthily is guilty of sinning against the body and blood of the Lord. That is why you should examine yourself before eating the bread and drinking the cup.
NLT: New Living Translation