First Letter to the Corinthians

I speak as to wise men. Judge what I say.

The cup of blessing which we bless, isn't it a communion of the blood of Christ? The bread which we break, isn't it a communion of the body of Christ?

Because we, who are many, are one bread, one body; for we all partake of the one bread.

Consider Israel after the flesh. Don't those who eat the sacrifices have communion with the altar?

What am I saying then? That a thing sacrificed to idols is anything, or that an idol is anything?

But I say that the things which the Gentiles sacrifice, they sacrifice to demons, and not to God, and I don't desire that you would have communion with demons.

You can't both drink the cup of the Lord and the cup of demons. You can't both partake of the table of the Lord, and of the table of demons.