Ephesians 6:5-8 NIV

[5] Slaves, obey your earthly masters with respect and fear, and with sincerity of heart, just as you would obey Christ. [6] Obey them not only to win their favor when their eye is on you, but as slaves of Christ, doing the will of God from your heart. [7] Serve wholeheartedly, as if you were serving the Lord, not people, [8] because you know that the Lord will reward each one for whatever good they do, whether they are slave or free.