Reference

2 Corinthians 6:14-18
Called to Stand Out

This is also an exhortation to believers in general, to forsake their company, companion, and conversation with the men of the world and be separated, says the Lord. 

There is a call to be set apart for God’s work. The people of God are a separate people in election, redemption, and the effectual calling, and ought to be so in their conduct and conversation; they ought to separate themselves from all superstition and will worship in religious matters, and from the evil customs and manners of the world.