John Chrysostom
"But what the heathen sacrifice," he says, "they sacrifice to demons and not to God" (1 Cor 10:20). Do not turn, then, to what is contrary to God. If you were a king’s son and, while sharing in your father’s table, wished to leave it and share in the table of criminals and imprisoned convicts, would your father allow it? On the contrary, he would strictly forbid it, not because that table could harm you, but because it dishonors your nobility and the royal table. So also these who sacrifice to idols are low slaves, criminals, and condemned prisoners, kept for severe punishment and worthy of a thousand penalties. How, then, are you not ashamed to rush, like gluttons and slaves, toward the table offered by these criminals and to share in what is offered? This is why I turn you away from it.
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The aim of those who offer sacrifices and the character of the persons receiving them make what is offered unclean. "But I do not want you to have communion with demons." Do you see the love of a caring father? Do you see how his very words express great goodwill? "I do not want," he says, "you to have any communion with them," the unbelievers. And since he was speaking in the form of counsel, lest any of the more stubborn disobey and consider himself entitled not to do this, he next pronounces a decisive decree. After the words, "But I do not want," and "Judge for yourselves," he says: "You cannot drink the cup of the Lord and the cup of demons. You cannot partake of the table of the Lord and of the table of demons" (1 Cor 10:21).