1 Corinthians 11:27-29

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.

But let a man examine himself, and so let him eat of [that] bread, and drink of [that] cup.

For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the Lord's body.