1 Corinthians (1 Co) 11:23-31

For what I received from the Lord is just what I passed on to you — that the Lord Yeshua, on the night he was betrayed, took bread; and after he had made the b’rakhah he broke it and said, “This is my body, which is for you. Do this as a memorial to me”; likewise also the cup after the meal, saying, “This cup is the New Covenant effected by my blood; do this, as often as you drink it, as a memorial to me.” For as often as you eat this bread and drink the cup, you proclaim the death of the Lord, until he comes. Therefore, whoever eats the Lord’s bread or drinks the Lord’s cup in an unworthy manner will be guilty of desecrating the body and blood of the Lord! So let a person examine himself first, and then he may eat of the bread and drink from the cup; for a person who eats and drinks without recognizing the body eats and drinks judgment upon himself. This is why many among you are weak and sick, and some have died! If we would examine ourselves, we would not come under judgment.