1 Corinthians 11:28, 31
1 Corinthians 11:28 AMP
But a person must [prayerfully] examine himself [and his relationship to Christ], and only when he has done so should he eat of the bread and drink of the cup.
1 Corinthians 11:31 AMP
But if we evaluated and judged ourselves honestly [recognizing our shortcomings and correcting our behavior], we would not be judged.