1 Corinthians 10:15-22 (NKJV)
15I speak as to wise men; judge for yourselves what I say. 16The cup of blessing which we bless, is it not the communion of the blood of Christ? The bread which we break, is it not the communion of the body of Christ? 17For we, though many, are one bread and one body; for we all partake of that one bread.
18Observe Israel after the flesh: Are not those who eat of the sacrifices partakers of the altar? 19What am I saying then? That an idol is anything, or what is offered to idols is anything? 20Rather, that the things which the Gentiles sacrifice they sacrifice to demons and not to God, and I do not want you to have fellowship with demons. 21You cannot drink the cup of the Lord and the cup of demons; you cannot partake of the Lord’s table and of the table of demons. 22Or do we provoke the Lord to jealousy? Are we stronger than He?