Colossians 3:23

Not only must the slave's work be done in the fear of the Lord, but done as if it were actually for the Lord that he was doing it, and not for a mere human master. And this principle is to govern every detail of his varied service. ἐκ ψυχῆς : heartily and with good will. οὐκ ἀνθρώποις : their service, Paul would say, is not to be rendered at all (οὐκ not μὴ) to their earthly master, but exclusively to Christ.