Romans 14:15

‘For if because of meat your brother is grieved, you are no longer walking in love. Do not destroy with your meat him for whom Christ died.'

Thus if the brother or sister who believed it to be wrong ate such meat they would be ‘grieved', (we might say, conscience-stricken and filled with a sense of having sinned). And if it was of our persuasion, because they were eating with us, possibly at ‘the love feast' or in a private gathering, then it would indicate that we were no longer walking in love. For we would be destroying them spiritually. So Paul exhorts them, ‘Do not destroy with your meat him for whom Christ died'. For us to do so would be for us to harm Christ Himself, for we would be harming one who was ‘in Christ', one for whom Christ sacrificed Himself. This, of course, applies not only to participating in unclean food, but to any way in which we might cause Christians to stumble. That those for whom Christ died can suffer God's judgment while still being ‘saved' is made clear in 1 Corinthians 11:30.