1 Corinthians 10:28
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 Lord's, and the fulness thereof:
Note 5 at 1Co 10:28: When individuals violate their own standards or the standards of others unknowingly, there is no fault on their part. This should be remembered when dealing with others and ourselves. It's the motive of the heart that matters.