'Idol sacrifices' in the Bible

'And concerning those of the nations who have believed, we have written, having given judgment, that they observe no such thing, except to keep themselves both from idol-sacrifices, and blood, and a strangled thing, and whoredom.'

'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;