Job 31:13

If I despise the cause of my man-servant, And of my handmaid, In their contending with me,

Exodus 21:20-21

And when a man smiteth his man-servant or his handmaid, with a rod, and he hath died under his hand -- he is certainly avenged;

Exodus 21:26-27

'And when a man smiteth the eye of his man-servant, or the eye of his handmaid, and hath destroyed it, as a freeman he doth send him away for his eye;

Leviticus 25:43

thou rulest not over him with rigour, and thou hast been afraid of thy God.

Leviticus 25:46

and ye have taken them for inheritance to your sons after you, to occupy for a possession; to the age ye lay service upon them, but upon your brethren, the sons of Israel, one with another, thou dost not rule over him with rigour.

Deuteronomy 15:12-15

When thy brother is sold to thee, a Hebrew or a Hebrewess, and he hath served thee six years -- then in the seventh year thou dost send him away free from thee.

Deuteronomy 24:14-15

'Thou dost not oppress a hireling, poor and needy, of thy brethren or of thy sojourner who is in thy land within thy gates;

Jeremiah 34:14-17

At the end of seven years ye do send forth each his brother, the Hebrew, who is sold to thee, and hath served thee six years, yea, thou hast sent him forth free from thee: and your fathers hearkened not unto Me, nor inclined their ear.

Ephesians 6:9

And the masters! the same things do ye unto them, letting threatening alone, having known that also your Master is in the heavens, and acceptance of persons is not with him.

Colossians 4:1

The masters! that which is righteous and equal to the servants give ye, having known that ye also have a Master in the heavens.

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
And when a man smiteth his man-servant or his handmaid, with a rod, and he hath died under his hand -- he is certainly avenged;
Leviticus 25:43
thou rulest not over him with rigour, and thou hast been afraid of thy God.
Deuteronomy 15:12
When thy brother is sold to thee, a Hebrew or a Hebrewess, and he hath served thee six years -- then in the seventh year thou dost send him away free from thee.
Jeremiah 34:14
At the end of seven years ye do send forth each his brother, the Hebrew, who is sold to thee, and hath served thee six years, yea, thou hast sent him forth free from thee: and your fathers hearkened not unto Me, nor inclined their ear.
Ephesians 6:9
And the masters! the same things do ye unto them, letting threatening alone, having known that also your Master is in the heavens, and acceptance of persons is not with him.
Colossians 4:1
The masters! that which is righteous and equal to the servants give ye, having known that ye also have a Master in the heavens.

General references

Exodus 21:26
'And when a man smiteth the eye of his man-servant, or the eye of his handmaid, and hath destroyed it, as a freeman he doth send him away for his eye;
Exodus 23:6
'Thou dost not turn aside the judgment of thy needy one in his strife;
Deuteronomy 24:14
'Thou dost not oppress a hireling, poor and needy, of thy brethren or of thy sojourner who is in thy land within thy gates;