1 Corinthians 11:25-27

25In the same way also he took the cup, after supper, and said, “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 the cup, you proclaim the Lord’s death until he comes.

27So, then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sin against the body and blood of the Lord.