If any one of them that believe not invites you. Here follows an exception, to this effect, that if a believer has been warned, that what is set before him has been offered to an idol, and sees that there is a danger of offense being given, he sins against the brethren if he does not abstain. He shows then, in short, that care must be taken not to hurt weak consciences. When he says -- and you are willing to go, he intimates indirectly, that he does not altogether approve of it, and that it would be better if they declined, but as it is a thing indifferent, he does not choose to forbid it absolutely. And, certainly, there could be nothing better than to keep at a distance from such snares -- not that those are expressly to be condemned, who accommodate themselves to men only in so far as conscience permits, [1] but because it becomes us to proceed with caution, [2] where we see that we are in danger of falling.

Footnotes

1 - "Seulement autant que faire se pent sans offenser Dieu;" -- "Only so far as they can do so without offending God."

2 - "Auec grand auis et prudence;" -- "With great care and prudence."

If any of them that believe not - That are not Christians; that are still pagans.
Bid you to a feast - Evidently not a feast in the temple of an idol, but at his own house. If he asks you to partake of his hospitality.
And ye be disposed to go - Greek, "And you will to go." It is evidently implied here that it would be not improper to go. The Saviour accepted such invitations to dine with the Pharisees (see the note at Luke 11:37); and Christianity is not designed to abolish the courtesies of social life; or to break the bonds of contact; or to make people misanthropes or hermits. It allows and cultivates, under proper Christian restraints, the contact in society which will promote the comfort of people, and especially that which may extend the usefulness of Christians. It does not require, therefore, that we should withdraw from social life, or regard as improper the courtesies of society; see the note at 1-Corinthians 5:10.
Whatsoever is set before you - Whether it has been offered in sacrifice or not; for so the connection requires us to understand it.
Eat - This should be interpreted strictly. The apostle says "eat," not "drink;" and the principle will not authorize us to "drink" whatever is set before us, asking no questions for conscience sake; for while it was matter of indifference in regard to eating, whether the meat had been sacrificed to idols or not, it is not a matter of indifference whether a man may drink intoxicating liquor. That is a point on which the "conscience" should have much to do; and on which its honest decisions, and the will of the Lord, should be faithfully and honestly regarded.

If any - bid you to a feast - The apostle means any common meal, not an idol festival; for to such no Christian could lawfully go.
Whatsoever is set before you, eat - Do not act as the Jews generally do, torturing both themselves and others with questions, such as those mentioned in 1-Corinthians 10:26.

If any of them that believe not,.... In Christ, and make no profession of faith in him; but are infidels to his person, office, grace, righteousness, Gospel, and ordinances, as there were many such at Corinth: "bid you" to a feast; invite you to dine or sup with them in their own houses:
and ye be disposed to go; the apostle does not lay any commands upon them to go, or not go, but leaves them to their own will, inclination, and discretion; for as circumstances might be, it might be either proper or improper to listen to an invitation from such a quarter; but if they were inclined, and did think fit to go, which they might without sin; for as it is lawful to trade, so to eat and drink with unbelievers; then his advice is,
whatsoever is set before you, eat, asking no questions for conscience sake; that is, as before, as whether it is offered to idols or not; lest either their own, or another's conscience should be hurt thereby.

ye be disposed to go--tacitly implying, they would be as well not to go, but yet not forbidding them to go (1-Corinthians 10:9) [GROTIUS]. The feast is not an idol feast, but a general entertainment, at which, however, there might be meat that had been offered to an idol.
for conscience' sake--(See on 1-Corinthians 10:25).

If any of them that believe not, etc. If invited to an unbeliever's house, go, if you wish, and eat what is set before you without question on account of conscience.
But if any man say unto you, etc. If some one points out that a part is from an idol's sacrifice, then it is not to be eaten; not because the food is sinful, but because the conscience of others might be offended.
Conscience . . . not thine own, but of the other. When one eats what he knows to be simply wholesome food, his own conscience is not offended, but that of another man. His liberty of conscience is not abridged by another man's want of knowledge.
For, if I by grace be a partaker, etc. If by God's gift I partake with thanksgiving to him, there should be no reproach.
Whether therefore ye eat or drink. The rule for eating and drinking is now given. It must be done all to the glory of God. This implies, (1) Thanksgiving to God. (2) Not doing what would put a stumbling-block in the way of weak brethren.
Give none offence. The rule just given implies this. Do nothing that would produce a scandal, or arouse prejudice, whether they be Jews, or Gentiles, or brethren.
Even as I please all men in all things. See notes on 1-Corinthians 9:20-23.