1 Corinthians 8:4

we know that an idol is nothing in the world, and that there is no God but one.

1 Corinthians 10:20

But that what the heathens sacrifice, they sacrifice to devils, and not to God. Now I would not that ye should be partakers with devils.

Treasury of Scripture Knowledge

Summary

Wherefore the anger of the LORD was kindled against Amaziah, and he sent unto him a prophet, which said unto him, Why hast thou sought after the gods of the people, which could not deliver their own people out of thine hand?

Bible References

Which could

1 Corinthians 8:4
we know that an idol is nothing in the world, and that there is no God but one.
1 Corinthians 10:20
But that what the heathens sacrifice, they sacrifice to devils, and not to God. Now I would not that ye should be partakers with devils.