Ephesians 6:5-8
Slaves, be obedient to your earthly masters, with respect and eager anxiety to please and with simplicity of motive as if you were obeying Christ.
Colossians 3:22-25
Slaves, be obedient in everything to your earthly masters; not in acts of eye service, as aiming only to please men, but with simplicity of purpose, because you fear the Lord.
Titus 2:9-10
Exhort slaves to be always obedient to their owners, and to give them satisfaction in everything, not contradicting and not pilfering,
1 Peter 2:18
Household servants, be submissive to your masters, and show them the utmost respect--not only if they are kind and thoughtful, but also if they are unreasonable.