demons

Did demons appear in the Old Testament

Of course they do, we find them in the poems:

Leviticus 17.7 "And they shall no more offer their sacrifices unto devils, after whom they have gone a whoring. This shall be a statute for ever unto them throughout their generations."

Deuteronomy 32.17 "They sacrificed unto devils, not to God; to gods whom they knew not, to new gods that came newly up,