Ephesians 6:9

You who are masters, too, must treat your slaves in the same way, and cease to threaten them, for you know that their Master and yours is in heaven, and that he will show no partiality.

Colossians 4:1

You who are masters must treat your slaves justly and fairly, and remember that you have a Master too, in heaven.

Treasury of Scripture Knowledge

Summary

If I did despise the cause of my manservant or of my maidservant, when they contended with me;

Bible References

The cause

Ephesians 6:9
You who are masters, too, must treat your slaves in the same way, and cease to threaten them, for you know that their Master and yours is in heaven, and that he will show no partiality.
Colossians 4:1
You who are masters must treat your slaves justly and fairly, and remember that you have a Master too, in heaven.