But if someone says to you, "This has been offered in sacrifice," then do not eat it, for the sake of the one who informed you, and for the sake of conscience --
Moses said to him, "As soon as I have gone out of the city, I will stretch out my hands to the LORD. The thunder will cease, and there will be no more hail, so that you may know that the earth is the LORD's.
However, not all possess this knowledge. But some, through former association with idols, eat food as really offered to an idol, and their conscience, being weak, is defiled.