"Slaves, obey your human masters with fear and trembling, in the sincerity of your heart, as to Christ." (Ephesians 6:5)
"Slaves, obey your human masters in everything; don't work only while being watched, in order to please men, but work wholeheartedly, fearing the Lord." (Colossians 3:22)
"Slaves are to be submissive to their masters in everything, and to be well-pleasing, not talking back ." (Titus 2:9)
"Slaves, submit yourselves to your masters with all respect, not only to the good and gentle but also to the cruel. " (1 Peter 2:18)