Ephesians 6:5-7

Slaves, obey your masters here on earth with fear and respect and from a sincere heart, just as you obey Christ. You must do this not only while they are watching you, to please them. With all your heart you must do what God wants as people who are obeying Christ. Do your work with enthusiasm. Work as if you were serving the Lord, not as if you were serving only men and women.