Ephesians 6:9

And you masters, act towards your slaves on the same principles, and refrain from threats. For you know that in Heaven there is One who is your Master as well as theirs, and that merely earthly distinctions there are none with Him.

Colossians 4:1

Masters, deal justly and equitably with your slaves, knowing that you too have a Master 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
And you masters, act towards your slaves on the same principles, and refrain from threats. For you know that in Heaven there is One who is your Master as well as theirs, and that merely earthly distinctions there are none with Him.
Colossians 4:1
Masters, deal justly and equitably with your slaves, knowing that you too have a Master in Heaven.