John Chrysostom

"And through thy meat he that is weak perisheth, the brother for whose sake Christ died." For there are two things which deprive you of excuse in this mischief; one, that he is weak, the other, that he is thy brother: rather, I should say, there is a third also, and one more terrible than all. What then is this? That whereas Christ refused not even to die for him, thou canst not bear even to accommodate thyself to him. By these means, you see, he reminds the perfect man also, what he too was before, and that for him He died. …

Homily on 1 Corinthians 20 ↗

Theophylact of Ohrid

Thus, your perfection will be the cause of the ruin of another, and moreover a weak one, and one for whom Christ died. "If Christ did not refuse even to die for him, how can you not abstain from foods, so that he may not be scandalized by your eating (επί τη ση βρώσει)," says Chrysostom.

Commentary on 1 Corinthians ↗

Irenaeus

It is plain, then, that Paul knew no other Christ besides Him alone, who both suffered, and was buried, and rose again, who was also born, and whom he speaks of as man. For after remarking, "But if Christ be preached, that He rose from the dead," he continues, rendering the reason of His incarnation, "For since by man came death, by man [came] also the resurrection of the dead." And everywhere, when [referring to] the passion of our Lord, and to His human nature, and His subjection to death, he employs the name of Christ, as in that …

Against Heresies Book III ↗