1 Corinthians 10:20-21

No, but that which the Gentiles sacrifice, they sacrifice to demons, not to God; and I would not have you have fellowship with one another through the demons.

1 Timothy 4:1

Now the Spirit expressly declares that in later times some will fall away from the faith, giving heed to deceiving spirits and the teachings of demons;

Revelation 16:14

For they are the spirits of demons working marvels--spirits that go out to control the kings of the whole earth, to assemble them for the battle which is to take place on the great day of God, the Ruler of all.

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 which the Gentiles sacrifice, they sacrifice to demons, not to God; and I would not have you have fellowship with one another through the demons.
1 Timothy 4:1
Now the Spirit expressly declares that in later times some will fall away from the faith, giving heed to deceiving spirits and the teachings of demons;
Revelation 16:14
For they are the spirits of demons working marvels--spirits that go out to control the kings of the whole earth, to assemble them for the battle which is to take place on the great day of God, the Ruler of all.