Colossians 3:22-24 NIV

[22] Slaves, 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. [23] Whatever you do, work at it with all your heart, as working for the Lord, not for human masters, [24] since you know that you will receive an inheritance from the Lord as a reward. It is the Lord Christ you are serving.