1 Corinthians 11:26-30 KJV

[26] For as often as ye eat this bread, and drink this cup, ye do shew the Lord's death till he come. [27] Wherefore whosoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord. [28] But let a man examine himself, and so let him eat of that bread, and drink of that cup. [29] For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body. [30] For this cause many are weak and sickly among you, and many sleep.