1 Corinthians 11:25-29

25In the same way, after supper He took the cup, saying, “This cup is the new covenant in My blood; do this, as often as you drink it, in remembrance of Me.” 26For as often as you eat this bread and drink this cup, you proclaim the Lord’s death until He comes.

27Therefore, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the1 body and blood of the Lord. 28Each one must examine himself before he eats of the bread and drinks of the cup. 29For anyone who eats and drinks without recognizing the body2 eats and drinks judgment on himself.