We can experience a spiritual intimacy with believers that is, of course, not possible with unbelievers. Thus the standard of care we owe to believers is greater than that owed to unbelievers. Fellow believers are like family and our responsibilities are correspondingly greater toward them. Nonetheless, there is a minimum standard of love we owe to all men and the verses that follow speak to that standard. The signature command to us would be “honor all men (1 Peter 2:17).
Romans 12:17, 18
1 Corinthians 5:9, 10 – Obviously, Paul is not calling for believers to keep aloof from unbelievers. He himself was a tentmaker by trade (Acts 18:3), which presumably would have brought him into contact with many unbelievers. Moreover, throughout the book of Acts, whenever we see Paul dealing with unbelieving Gentiles, we see him doing so in a respectful manner.
1 Peter 2:17