John Chrysostom
The harm you inflict is inexcusable for two reasons: because your neighbor is weak, and because he is your brother. But there is also a third reason, the most fearful. What is it? Christ did not refuse to die for him, yet you are unwilling even to show him condescension.
By these words the Apostle reminds the perfect man what he himself once was, and that Christ died for him. He does not say, "for whom you ought to have died," but something far stronger: "for whom Christ died." Your Master did not refuse to die for him, yet you pay him no attention. You are unwilling, for his sake, to abstain even from an unclean table. You allow him to perish after his salvation has thus been accomplished, and what is most grievous, for the sake of food.
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He did not say, "because of your perfection," or "because of your knowledge," but "because of your food." Thus here there are four charges, and very serious ones: your brother, weak, so beloved by Christ that He even died for him, is brought to destruction, and that because of food.