1 Corinthians 8:4

Concerning the eating of the things offered in sacrifice to idols, then, we know that an idol is nothing in the world, and that there is no other God but one.

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.

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
Concerning the eating of the things offered in sacrifice to idols, then, we know that an idol is nothing in the world, and that there is no other God but one.
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.