1 Corinthians 11:27-29

11:27 For this reason, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of the body and blood of the Lord. 11:28 A person should examine himself first, and in this way let him eat the bread and drink of the cup. 11:29 For the one who eats and drinks without careful regard for the body eats and drinks judgment against himself.