I Corinthians 10:21

Ye cannot drink the cup of the Lord--really and spiritually; though ye may outwardly (Kg1 18:21). cup of devils--in contrast to the cup of the Lord. At idol feasts libations were usually made from the cup to the idol first, and then the guests drank; so that in drinking they had fellowship with the idol. the Lord's table--The Lord's Supper is a feast on a table, not a sacrifice on an altar. Our only altar is the cross, our only sacrifice that of Christ once for all. The Lord's Supper stands, however, in the same relation, analogically, to Christ's sacrifice, as the Jews' sacrificial feasts did to their sacrifices (compare Mal 1:7, "altar . . . table of the Lord"), and the heathen idol feasts to their idolatrous sacrifices (Isa 65:11). The heathen sacrifices were offered to idol nonentities, behind which Satan lurked. The Jews' sacrifice was but a shadow of the substance which was to come. Our one sacrifice of Christ is the only substantial reality; therefore, while the partaker of the Jew's sacrificial feast partook rather "of the altar" (Co1 10:18) than of GOD manifested fully, and the heathen idol-feaster had fellowship really with demons, the communicant in the Lord's Supper has in it a real communion of, or fellowship in, the body of Christ once sacrificed, and now exalted as the Head of redeemed humanity.

In this chapter the apostle prosecutes the argument at the close of the last, and, I. Warns the Corinthians against security, by the example of the Jews, who, notwithstanding their profession and privileges, were terribly punished of God for their many sins, their history being left upon record for the admonition of Christians (Co1 10:1-14). II. He resumes his former argument (Co1 8:1-13), about eating things offered to idols; and shows that it was utterly inconsistent with true Christianity, that it was downright gross idolatry, to eat them as things offered to idols; it is having fellowship with devils, which cannot consist with having fellowship with God (Co1 10:15-22). III. He lets them yet know that though they must not eat of things sacrificed to idols as such, and out of any regard to the idol, yet they might buy such flesh in the markets, or eat it at the table of heathen acquaintances, without asking any questions; for that the heathens' abuse of them did not render the creatures of God unfit to be the food of his servants. Yet liberty of this kind must be used with a due regard to weak consciences, and no offence given by it t Jew nor Gentile, nor to the church of God (Co1 10:23 to the end).

10:21 Believers should avoid participating in religious meals eaten in a pagan temple (see 8:10), because those united to the Lord (Christ) cannot simultaneously be united to demons (see 2 Cor 6:14-16).