1 Corinthians 11:26-29

For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until He comes. Therefore whoever eats the bread or drinks the cup of the Lord in an unworthy manner, shall be guilty of the body and the blood of the Lord. But a man must examine himself, and in so doing he is to eat of the bread and drink of the cup. For he who eats and drinks, eats and drinks judgment to himself if he does not judge the body rightly.