Colossians 3:22-24

Servants, obey in everything those who are your earthly masters, not only when their eyes are on you as pleasers of men, but in simplicity of purpose [with all your heart] because of your reverence for the Lord and as a sincere expression of your devotion to Him. Whatever may be your task, work at it heartily (from the soul), as [something done] for the Lord and not for men, Knowing [with all certainty] that it is from the Lord [and not from men] that you will receive the inheritance which is your [real] reward. [The One Whom] you are actually serving [is] the Lord Christ (the Messiah).