Colossians 3:22-24

22Slaves, obey your earthly masters in everything; and do it, not only when their eye is on you and to curry their favor, but with sincerity of heart and reverence for the Lord. 23Whatever you do, work at it with all your heart, as working for the Lord, not for human masters, 24since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving.