1 Corinthians 11:24-28

and when He had given thanks, He broke it and said, “This is My body, which is for you; do this in remembrance of Me.”

In the same way He also took the cup after supper, saying, “This cup is the new covenant in My blood; do this, as often as you drink it, in remembrance of Me.”

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 way, shall be guilty of the body and the blood of the Lord.

But a person must examine himself, and in so doing he is to eat of the bread and drink of the cup.