1 Corinthians 11:29-31

For anyone who eats and drinks [without solemn reverence and heartfelt gratitude for the sacrifice of Christ], eats and drinks a judgment on himself if he does not recognize the body [of Christ]. That [careless and unworthy participation] is the reason why many among you are weak and sick, and a number sleep [in death]. But if we evaluated and judged ourselves honestly [recognizing our shortcomings and correcting our behavior], we would not be judged.