Matthew Poole and continuators on 1 Corinthians 10:28

28 But if any man say unto you, This is offered in sacrifice unto idols, eat not for his sake that shewed it, and for conscience sake : For the earth is the Lords, and the fulness thereof .

The meat being out of the Idols Temple, and returned to a common use, there could be no impiety in eating it, no communion with Devils, and partaking of the Table of Devils, in and by such an action; but yet there might be a breach of Charity in the action, that is, in case one were there present, who knew that it had been so offered to the Idol, and declared his offence, by telling the Christian that was about to eat, that that meat had been so offered, in that case the Apostle commandeth Christians

He gives them as a reason for it, Because the earth is the Lords, and the fulness thereof, that is, because there was other meat enough to eat. This passage taken out of the Psalmist had a something different application, v. 26. there the Apostle used it to justifie the lawfulness of their eating such meat, returned again to a common use, and exposed to sale in the shambles: here he useth it to disswade them from eating, if any let them know it had been offered to the Idol.

Marginal references: Chap. 8.10, 11.; not to eat, and that partly for his sake that shewed it, lest they should lay a stumbling-block before him, and by their example imbolden him that shewed it to do the like, though he doubted the lawfulness of it; and likewise for conscience sake, that is, for their own conscience sake, which through weakness might afterward trouble them for it, though without just cause.; Deut. 10.14, Psal. 24.1. Vers. 26.