Titus 2:9

Slaves. Half the world were slaves in that period of time, therefore many early Christians were slaves. There was a danger they would think their coming to Christ would free them from civil law. Compare Romans 13:1-8. Paul's Letter to Philemon tells us something about a slave who becomes a Christian. They must not talk back to them. Not being arrogant or insulting to their masters; not opposing their plans and trying to sabotage their business. See 1 Peter 2:18.