1 Corinthians 10:16-21

Is the cup of blessing which we bless [at the Lord’s Supper] not a sharing in the blood of Christ? [Indeed it is.] Is the bread which we break not a sharing in the body of Christ? [Indeed it is.] Since there is one bread, we [believers] who are many are [united into] one body; for we all partake of the one bread [which represents the body of Christ]. Consider the people of Israel; are those who eat the sacrifices not partners of the altar [united in their worship of the same God]? [Indeed they are.] [Lev 7:6] What do I mean then? That a thing offered to idols is anything [special or changed simply because it is offered], or that an idol is anything? On the contrary, the things which the Gentiles (pagans) sacrifice, they sacrifice to demons [in effect], and not to God; and I do not want you to become partners with demons [by eating at feasts in pagan temples]. [Deut 32:17] You cannot drink [both] the Lord’s cup and the cup of demons. You cannot share in both the Lord’s table and the table of demons [thereby becoming partners with them].