Ephesians 6:6-8

6not in the way of eye-service [working only when someone is watching you and only] to please men, but as slaves of Christ, doing the will of God from your heart;

7rendering service with goodwill, as to the Lord, and not [only] to men,

8knowing that whatever good thing each one does, he will receive this back from the Lord, whether [he is] slave or free.