18 That's basically what happened even in old Israel - those who ate the sacrifices offered on God's altar entered into God's action at the altar. 19 Do you see the difference? Sacrifices offered to idols are offered to nothing, for what's the idol but a nothing? 20 Or worse than nothing, a minus, a demon! I don't want you to become part of something that reduces you to less than yourself. 21 And you can't have it both ways, banqueting with the Master one day and slumming with demons the next. 22 Besides, the Master won't put up with it. He wants us - all or nothing. Do you think you can get off with anything less?
Matthew Henry's Commentary on 1 Corinthians 10:18-22
Commentary on 1 Corinthians 10:15-22
(Read 1 Corinthians 10:15-22)
Did not the joining in the Lord's supper show a profession of faith in Christ crucified, and of adoring gratitude to him for his salvation ? Christians, by this ordinance, and the faith therein professed, were united as the grains of wheat in one loaf of bread, or as the members in the human body, seeing they were all united to Christ, and had fellowship with him and one another. This is confirmed from the Jewish worship and customs in sacrifice. The apostle applies this to feasting with idolaters. Eating food as part of a heathen sacrifice, was worshipping the idol to whom it was made, and having fellowship or communion with it; just as he who eats the Lord's supper, is accounted to partake in the Christian sacrifice, or as they who ate the Jewish sacrifices partook of what was offered on their altar. It was denying Christianity; for communion with Christ, and communion with devils, could never be had at once. If Christians venture into places, and join in sacrifices to the lust of the flesh, the lust of the eye, and the pride of life, they will provoke God.