1 Corinthians 11:23-34
The Institution of the Lord's Supper
For I received from the Lord what I also handed on to you, that the Lord Jesus on the night when he was betrayed took a loaf of bread, and when he had given thanks, he broke it and said, “This is my body that is for you. Do this in remembrance of me.” In the same way he took the cup also, after supper, 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 the cup, you proclaim the Lord's death until he comes.
Partaking of the Supper Unworthily
Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be answerable for the body and blood of the Lord. Examine yourselves, and only then eat of the bread and drink of the cup. For all who eat and drink without discerning the body, eat and drink judgment against themselves. For this reason many of you are weak and ill, and some have died. But if we judged ourselves, we would not be judged. But when we are judged by the Lord, we are disciplined so that we may not be condemned along with the world.
So then, my brothers and sisters, when you come together to eat, wait for one another. If you are hungry, eat at home, so that when you come together, it will not be for your condemnation. About the other things I will give instructions when I come.