1 Corinthians 11:23-31

For I received from the Lord, that which I also delivered to you, that the Lord Jesus, in the night in which he was delivered up, took bread, and having given thanks broke it, and said, This is my body, which is for you: this do in remembrance of me. In like manner also the cup, after having supped, saying, This cup is the new covenant in my blood: this do, as often as ye shall drink it, in remembrance of me. For as often as ye shall eat this bread, and drink the cup, ye announce the death of the Lord, until he come. So that whosoever shall eat the bread, or drink the cup of the Lord, unworthily, shall be guilty in respect of the body and of the blood of the Lord. But let a man prove himself, and thus eat of the bread, and drink of the cup. For the eater and drinker eats and drinks judgment to himself, not distinguishing the body. On this account many among you are weak and infirm, and a good many are fallen asleep. But if we judged ourselves, so were we not judged.