1 Corinthians 11:27-29 NIV

27 So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord.

References for 1 Corinthians 11:27

28 Everyone ought to examine themselves before they eat of the bread and drink from the cup.

References for 1 Corinthians 11:28

29 For those who eat and drink without discerning the body of Christ eat and drink judgment on themselves.