'Idol sacrifices' in the Bible

But I have a few things against thee, because thou have there men who adhere to the teaching of Balaam, who taught Balak to cast a snare before the sons of Israel, even to eat idol sacrifices, and to fornicate.

Nevertheless, I have against thee that thou tolerate thy woman Jezebel. She calls herself a prophetess, and teaches and leads astray my bondmen to fornicate, and to eat idol sacrifices.