John Chrysostom
Having said that it is impossible to drink the cup of the Lord and also the cup of demons, he urged complete abstinence from those demonic tables by the example of the Jews, by human considerations, by pointing to the dread mysteries, and by indicating what is done in the temples. After arousing great fear in the Corinthians, he then prevents this fear from bringing them to another extreme. They might, through excessive caution, begin to fear some similar defilement without their knowledge, as in the market or in some other way. The Apostle frees them from this fear and says, “Eat whatever is sold in the meat market, asking no question.” If, he says, you eat without knowing and without hearing that it is an idol-sacrifice, you are not subject to punishment.
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This is a matter of ignorance, not lack of self-control. He frees them not only from this fear, but also from another, granting them great independence and freedom. He does not permit them even to doubt, that is, to investigate and inquire whether it has been sacrificed to idols. He commands them simply to eat everything found in the market, without asking what is being offered. Therefore one who eats through ignorance remains guiltless. What has been sacrificed to idols is not evil by nature, but produces defilement by the disposition of the one who eats.