1 Corinthians 10:18

"Behold Israel after the flesh: have not they which eat the sacrifices communion with the altar?" Again, from the old covenant he leads them unto this point also. For because they were far beneath the greatness of the things which had been spoken, he persuades them both from former things and from those to which they were accustomed. And he says well, "according to the flesh," as though they themselves were according to the Spirit. And what he says is of this nature: "even from persons of the grossest sort ye may be instructed that they who eat the sacrifices, have communion with the altar." Dost thou see how he intimates that they who seemed to be perfect have not perfect knowledge, if they know not even this, that the result of these sacrifices to many oftentimes is a certain communion and friendship with devils, the practice drawing them on by degrees? For if among men the fellowship of salt and the table becomes an occasion and token of friendship, it is possible that this may happen also in the case of devils. But do thou, I pray, consider, how with regard to the Jews he said not, "they are partakers with God," but, "they have communion with the altar;" for what was placed thereon was burnt: but in respect to the Body of Christ, not so. But how? It is "a Communion of the Lord's Body." For not with the altar, but with Christ Himself, do we have communion.