'Idol sacrifices' in the Bible

Yet I have a few things against thee, that thou hast there some who hold the doctrine of Balaam, who taught Balac to lay a stumbling-block before the children of Israel, to eat of idol sacrifices, and to commit whoredom.

Yet I have a few things against thee, because thou hast suffered that woman Jezabel, calling herself a prophetess, to teach, and to lead my servants into error, to commit whoredom, and eat the idol sacrifices.