Thematic Bible: What cannot have communion together

Be not unequally yoked with unbelievers; for what fellowship has righteousness with lawlessness? what communion has light with darkness? What concord has Christ with Belial? What portion has a believer with an unbeliever? And what compact has God's temple with idols? For we are a temple of the living God, as he has said: I will dwell among them, and walk about among them; I will be their God, and they will be my people.

On the contrary, what the heathen sacrifice they sacrifice to demons and not to God, and I do not want you to have communion with demons. You cannot drink the cup of the Lord and also the cup of demons; you cannot be partakers in the Lord's table and in the table of demons.