1 Corinthians 11:29

29.He who shall eat unworthily, eateth judgment to himself. He had previously pointed out in express terms the heinousness of the crime, when he said that those who should eat unworthily would be guilty of the body and blood of the Lord Now he alarms them, by denouncing punishment; (706) for there are many that are not affected with the sin itself; unless they are struck down by the judgment of God. This, then, he does, when he declares that this food, otherwise health-giving, will turn out to their destruction, and will be converted into poison to those that eat unworthily

He adds the reasons because they distinguish not the Lord’s body, that is, as a sacred thing from a profane. “They handle the sacred body of Christ with unwashed hands, (Mark 7:2,) (707) nay more, as if it were a thing of nought, they consider not how great is the value of it. (708) They will therefore pay the penalty of so dreadful a profanation.” Let my readers keep in mind what I stated a little ago, that the body (709) is presented to them, though their unworthiness deprives them of a participation in it.