1 Corinthians 11:28-32

Let a man [thoroughly] examine himself, and [only when he has done] so should he eat of the bread and drink of the cup. For anyone who eats and drinks without discriminating and recognizing with due appreciation that [it is Christ's] body, eats and drinks a sentence (a verdict of judgment) upon himself. That [careless and unworthy participation] is the reason many of you are weak and sickly, and quite enough of you have fallen into the sleep of death. For if we searchingly examined ourselves [detecting our shortcomings and recognizing our own condition], we should not be judged and penalty decreed [by the divine judgment]. But when we [fall short and] are judged by the Lord, we are disciplined and chastened, so that we may not [finally] be condemned [to eternal punishment along] with the world.