10 For instance, say you flaunt your freedom by going to a banquet thrown in honor of idols, where the main course is meat sacrificed to idols. Isn't there great danger if someone still struggling over this issue, someone who looks up to you as knowledgeable and mature, sees you go into that banquet? The danger is that he will become terribly confused - maybe even to the point of getting mixed up himself in what his conscience tells him is wrong. 11 Christ gave up his life for that person. Wouldn't you at least be willing to give up going to dinner for him - because, as you say, it doesn't really make any difference? But it does make a difference if you hurt your friend terribly, risking his eternal ruin! 12 When you hurt your friend, you hurt Christ. A free meal here and there isn't worth it at the cost of even one of these "weak ones."
Matthew Henry's Commentary on 1 Corinthians 8:10-12
Commentary on 1 Corinthians 8:7-13
(Read 1 Corinthians 8:7-13)
Eating one kind of food, and abstaining from another, have nothing in them to recommend a person to God. But the apostle cautions against putting a stumbling-block in the way of the weak; lest they be made bold to eat what was offered to the idol, not as common food, but as a sacrifice, and thereby be guilty of idolatry. He who has the Spirit of Christ in him, will love those whom Christ loved so as to die for them. Injuries done to Christians, are done to Christ; but most of all, the entangling them in guilt: wounding their consciences, is wounding him. We should be very tender of doing any thing that may occasion stumbling to others, though it may be innocent in itself. And if we must not endanger other men's souls, how much should we take care not to destroy our own! Let Christians beware of approaching the brink of evil, or the appearance of it, though many do this in public matters, for which perhaps they plead plausibly. Men cannot thus sin against their brethren, without offending Christ, and endangering their own souls.