1 Corinthians 10:20

Nay, but that what they sacrifice, they sacrifice to demons, and not to God; and I would not that ye should have communion with demons.

Revelation 9:20

And the rest of men, who were not killed by these plagues, did not repent of the works of their hands, that they should not worship demons, and idols of gold, and of silver, and of brass, and of stone, and of wood, which can neither see; nor hear, nor walk;

2 Corinthians 4:4

in whom the God of this world blinded the understandings of the unbelieving, so that they cannot behold the light of the gospel of the glory of Christ, who is the image of God.

Treasury of Scripture Knowledge

Summary

But I say, that the things which the Gentiles sacrifice, they sacrifice to devils, and not to God: and I would not that ye should have fellowship with devils.

Bible References

Sacrifice

2 Corinthians 4:4
in whom the God of this world blinded the understandings of the unbelieving, so that they cannot behold the light of the gospel of the glory of Christ, who is the image of God.
Revelation 9:20
And the rest of men, who were not killed by these plagues, did not repent of the works of their hands, that they should not worship demons, and idols of gold, and of silver, and of brass, and of stone, and of wood, which can neither see; nor hear, nor walk;