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. — 1 Corinthians 10:21
They sacrificed to demons, not God, to gods that they didn’t know, to new gods that came up recently, which your fathers didn’t dread. — Deuteronomy 32:17
Don’t be unequally yoked with unbelievers, for what fellowship have righteousness and iniquity? Or what fellowship has light with darkness? What agreement has Christ with Belial? Or what portion has a believer with an unbeliever? What agreement has a temple of God with idols? For you are a temple of the living God. Even as God said, “I will dwell in them, and walk in them; and I will be their God, and they will be my people.” — 2 Corinthians 6:14
Therefore concerning the eating of things sacrificed to idols, we know that no idol is anything in the world, and that there is no other God but one. — 1 Corinthians 8:4