Charles Ellicott Commentary 1 Corinthians 8:10

"For if a man see thee who hast knowledge sitting at meat in an idol`s temple, will not his conscience, if he is weak, be emboldened to eat things sacrificed to idols?" — 1 Corinthians 8:10 (ASV)

For if any man (that is, any of the weak brothers) see thee which hast knowledge.—The fact of your being openly advanced in the knowledge of the faith will make your example more dangerous, because more effective.

Sit at meat in the idol’s temple.—Some went so far as to not only eat, but to eat within the grounds of the pagan temple. The Apostle, being concerned now only with the point of eating, does not rebuke this practice here, but he does so fully in 1 Corinthians 10:14–22. He probably mentions this fact here as an instance where the pagan convert could not ease his conscience by thinking that it was uncertain from where the meat had come.

Be emboldened.—Better, be built up. The people addressed had probably argued that the force of their example would build up others. Yes, says St. Paul, with irony, it will build him up—to do what, being weak, he cannot do without sin.