Paul the apostle, re: masters and slaves

Ephesians 6:5-9
5 Slaves*, obey your earthly masters with fear and trembling, with a sincere heart, as you would Christ, 6 not by the way of eye-service, as people-pleasers, but as servants of Christ, doing the will of God from the heart, 7 rendering service with a good will as to the Lord and not to man, 8 knowing that whatever good anyone does, this he will receive back from the Lord, whether he is a slave or free. 9 Masters, do the same to them, and stop your threatening, knowing that he who is both their Master and yours is in heaven, and that there is no partiality with him.

Colossians 3:22-24
22 Slaves, obey in everything those who are your earthly masters, not by way of eye-service, as people-pleasers, but with sincerity of heart, fearing the Lord. 23 Whatever you do, work heartily, as for the Lord and not for men, 24 knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ.

Colossians 4:1
1 Masters, treat your slaves justly and fairly, knowing that you also have a Master in heaven.

1 Timothy 6:1
1 Let all who are under a yoke as slaves regard their own masters as worthy of all honor, so that the name of God and the teaching may not be reviled.

Titus 2:9-10
9 Slaves are to be submissive to their own masters in everything; they are to be well-pleasing, not argumentative, 10 not pilfering, but showing all good faith, so that in everything they may adorn the doctrine of God our Savior.

*Greek: bondservants