1 Corinthians 10:20-21

No, but that what the heathen sacrifice they offer to demons and not to God, and I do not want you to have fellowship with demons.

1 Timothy 4:1

The Spirit distinctly says that in later times some will turn away from the faith, and devote their attention to deceitful spirits and the things that demons teach

Revelation 16:14

They are demon spirits that perform wonders, and they go out to the kings all over the world to muster them for battle on the great Day of God Almighty.

Treasury of Scripture Knowledge

Summary

And he ordained him priests for the high places, and for the devils, and for the calves which he had made.

Bible References

For the devils

1 Corinthians 10:20
No, but that what the heathen sacrifice they offer to demons and not to God, and I do not want you to have fellowship with demons.
1 Timothy 4:1
The Spirit distinctly says that in later times some will turn away from the faith, and devote their attention to deceitful spirits and the things that demons teach
Revelation 16:14
They are demon spirits that perform wonders, and they go out to the kings all over the world to muster them for battle on the great Day of God Almighty.