'Idol sacrifices' in the Bible

'But I have against thee a few things: That thou hast there those holding the teaching of Balaam, who did teach Balak to cast a stumbling-block before the sons of Israel, to eat idol-sacrifices, and to commit whoredom;

'But I have against thee a few things: That thou dost suffer the woman Jezebel, who is calling herself a prophetess, to teach, and to lead astray, my servants to commit whoredom, and idol-sacrifices to eat;