1 Cor 10:19-21 NIV

Do I mean then that a sacrifice offered to an idol is anything or that an idol is anything? No, but the sacrifices of pagans are offered to demons, not to God, and I do not want you to be participants with demons. You cannot drink the cup of the Lord and the cup of demons, too; you cannot have a part in both the Lord’s table and the table of demons. (1 Cor 10:19-21 NIV)