Job 31:13

If I have rejected the cause of my male or female slaves, when they brought a complaint against me

Exodus 21:20-21

If a slave owner takes a stick and beats his slave, whether male or female, and the slave dies on the spot, the owner is to be punished.

Exodus 21:26-27

If a man strikes the eye of his male or female slave, and destroys it, he shall let him go free because of his eye.

Leviticus 25:43

Do not treat them harshly. Respect your God.

Leviticus 25:46

You may leave them as an inheritance to your children, whom they must serve as long as they live. But you must not treat any Israelites harshly.

Deuteronomy 15:12-15

If you buy Israelites (your own brothers) as slaves, you must set them free after six years.

Deuteronomy 24:14-15

Do not oppress a hired servant who is poor and needy, whether he is one of your brothers or one of your aliens who is in your land in your towns.

Jeremiah 34:14-17

Every seven years each of you must free any Hebrews who sold themselves to you. When they have served you for six years, you must set them free. But your ancestors refused to obey me or listen to me.

Ephesians 6:9

You masters, do the same things to them. Do not threaten! You know that he who is both their Master and yours is in heaven. There is no favoritism with him.

Colossians 4:1

Masters, give your servants that which is just and equal. You know that you also 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

Exodus 21:20
If a slave owner takes a stick and beats his slave, whether male or female, and the slave dies on the spot, the owner is to be punished.
Leviticus 25:43
Do not treat them harshly. Respect your God.
Deuteronomy 15:12
If you buy Israelites (your own brothers) as slaves, you must set them free after six years.
Jeremiah 34:14
Every seven years each of you must free any Hebrews who sold themselves to you. When they have served you for six years, you must set them free. But your ancestors refused to obey me or listen to me.
Ephesians 6:9
You masters, do the same things to them. Do not threaten! You know that he who is both their Master and yours is in heaven. There is no favoritism with him.
Colossians 4:1
Masters, give your servants that which is just and equal. You know that you also have a Master in heaven.

General references

Exodus 21:26
If a man strikes the eye of his male or female slave, and destroys it, he shall let him go free because of his eye.
Exodus 23:6
Do not deny justice to a poor person at his trial.
Deuteronomy 24:14
Do not oppress a hired servant who is poor and needy, whether he is one of your brothers or one of your aliens who is in your land in your towns.