Ephesians 6:5–9 (see note below)
 Bondservants, obey your earthly masters with fear and trembling, with a sincere heart, as you would Christ,  not by the way of eye-service, as people-pleasers, but as bondservants of Christ, doing the will of God from the heart,  rendering service with a good will as to the Lord and not to man,  knowing that whatever good anyone does, this he will receive back from the Lord, whether he is a bondservant or is free.  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. (ESV)
Colossians 3:22–4:1 (see note below)
 Bondservants, 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.  Whatever you do, work heartily, as for the Lord and not for men,  knowing that from the Lord you will receive the inheritance as your reward. You are serving the Lord Christ.  For the wrongdoer will be paid back for the wrong he has done, and there is no partiality.
 Masters, treat your bondservants justly and fairly, knowing that you also have a Master in heaven. (ESV)
1 Peter 2:18–23 (see note below)
 Servants, be subject to your masters with all respect, not only to the good and gentle but also to the unjust.  For this is a gracious thing, when, mindful of God, one endures sorrows while suffering unjustly.  For what credit is it if, when you sin and are beaten for it, you endure? But if when you do good and suffer for it you endure, this is a gracious thing in the sight of God.  For to this you have been called, because Christ also suffered for you, leaving you an example, so that you might follow in his steps.  He committed no sin, neither was deceit found in his mouth.  When he was reviled, he did not revile in return; when he suffered, he did not threaten, but continued entrusting himself to him who judges justly. (ESV)
While Paul and Peter refer, not to employers and employees, but to masters and slaves, it’s important to remember that while some slaves in the ancient world were mistreated, many were treated well and did important work. They could serve as doctors, teachers and managers. Think of Joseph in the Old Testament who was Potiphar’s slave. However, he was put in charge of Potiphar’s household. Therefore, what Paul and Peter say to masters and slaves applies to employers and employees in our day.