1 Corinthians 11:31

Judge. Gr. diakrinō “to discern,” “to discriminate.” Diakrinō is translated “discerning” in v. 29. The word signifies self-judgment, a diagnosis of one’s own moral condition in the light of God’s standard. If believers would scrutinize strictly their own attitudes and conduct and take part in the ordinance with a proper reverence, they would not come under the condemnation of God.

Be judged. That is, by God. A proper self-examination would save believers from divine judgment. The experience of the Corinthian believers is recorded for our learning. If Christians would remember this experience of the early church at Corinth, and be scrupulous about examining their thoughts and feelings and motives, they would derive much greater blessing from partaking of the ordinance, and would avoid meriting the displeasure of God.