Ephesians 6:5-8
Slaves, obey your earthly masters, with anxious care, giving them ungrudging service, as if obeying the Christ;
Colossians 3:22-25
Slaves, always obey your earthly masters, not only when their eyes are on you, as if you had but to please men, but giving them ungrudging service, in your reverence for the Master.
Titus 2:9-10
Urge slaves to be submissive to their owners in all circumstances, and to try their best to please them.
1 Peter 2:18
Those of you who are domestic servants should always be submissive and respectful to their masters, not only to those who are good and considerate, but also to those who are arbitrary.