If any of them that believe not bid you to a feast, and ye be disposed to go; whatsoever is set before you, eat, asking no question for conscience sake. If any - bid you to a feast - The apostle means any common meal, not an idol festival; for to such no Christian could lawfully go.
Whatsoever is set before you, eat - Do not act as the Jews generally do, torturing both themselves and others with questions, such as those mentioned in 1 Corinthians 10:26.