1 Corinthians 11:28 YLT

²⁶  for as often as ye may eat this bread, and this cup may drink, the death of the Lord ye do shew forth -- till he may come;

²⁷  so that whoever may eat this bread or may drink the cup of the Lord unworthily, guilty he shall be of the body and blood of the Lord:

²⁸  and let a man be proving himself, and so of the bread let him eat, and of the cup let him drink;

²⁹  for he who is eating and drinking unworthily, judgment to himself he doth eat and drink -- not discerning the body of the Lord.

³⁰  Because of this, among you many 'are' weak and sickly, and sleep do many;