{5} I speak as to wise men; judge ye what I say.

(5) Now returning to those idol's feasts, that he may not seem to delay at all: first he promises that he will use no other reasons, than such as they knew very well themselves. He gives the following line of reasoning. The holy banquets of the Christians are pledges, first of all, of the community that they have with Christ, and next, one with another. The Israelites also do ratify in the sacrifices, their mutual union in the very same religion. Therefore so do the idolaters also join themselves with their idols, or demons rather (for idols are nothing) in those solemn banquets, whereupon it follows, that that table is a table of demons, and therefore you must avoid it. For you cannot be partakers of the Lord and of idols together, much less may such banquets be considered as indifferent things. Will you then strive with God? And if you do, do you think that you will get the upper hand?

Jamieson-Fausset-Brown Bible Commentary

15. Appeal to their own powers of judgment to weigh the force of the argument that follows: namely, that as the partaking of the Lord's Supper involves a partaking of the Lord Himself, and the partaking of the Jewish sacrificial meats involved a partaking of the altar of God, and, as the heathens sacrifice to devils, to partake of an idol feast is to have fellowship with devils. We cannot divest ourselves of the responsibility of "judging" for ourselves. The weakness of private judgment is not an argument against its use, but its abuse. We should the more take pains in searching the infallible word, with every aid within our reach, and above all with humble prayer for the Spirit's teaching (Ac 17:11). If Paul, an inspired apostle, not only permits, but urges, men to judge his sayings by Scripture, much more should the fallible ministers of the present visible Church do so.

To wise men-refers with a mixture of irony to the Corinthian boast of "wisdom" (1Co 4:10; 2Co 11:19). Here you have an opportunity of exercising your "wisdom" in judging "what I say."

Matthew Henry's Concise Commentary

10:15-22 Did not the joining in the Lord's supper show a profession of faith in Christ crucified, and of adoring gratitude to him for his salvation ? Christians, by this ordinance, and the faith therein professed, were united as the grains of wheat in one loaf of bread, or as the members in the human body, seeing they were all united to Christ, and had fellowship with him and one another. This is confirmed from the Jewish worship and customs in sacrifice. The apostle applies this to feasting with idolaters. Eating food as part of a heathen sacrifice, was worshipping the idol to whom it was made, and having fellowship or communion with it; just as he who eats the Lord's supper, is accounted to partake in the Christian sacrifice, or as they who ate the Jewish sacrifices partook of what was offered on their altar. It was denying Christianity; for communion with Christ, and communion with devils, could never be had at once. If Christians venture into places, and join in sacrifices to the lust of the flesh, the lust of the eye, and the pride of life, they will provoke God.