1 Corinthians 10:19-21

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].