Deuteronomy 15:13

And when you send him [out] free from you, you shall not send him [away] empty-handed.

Genesis 31:42

If the God of my father, the God of Abraham and the Fear of Isaac had not been with me, indeed now you would have sent me away empty-handed. God saw my misery and the labor of my hands and rebuked you last night."

Exodus 3:21

And I will give this people favor in the eyes of [the] Egyptians, {and then} when you go, you will not go empty-handed.

Leviticus 25:42-44

Because they [are] my servants whom I brought out from the land of Egypt, they shall not be sold {as a slave}.

Proverbs 3:27-28

Do not withhold good from its owner when it is in the power of your hand to do.

Jeremiah 22:13

Woe [to the one who] builds his house without righteousness, and his upper rooms without justice. His fellow countryman, he works for nothing, and he does not give to him his wages.

Malachi 3:5

"Then I will approach you for judgment, and I will be a swift witness against the sorcerers and against the adulterers, and against those who swear {falsely}, and against the oppressors of [the] hired worker [with his] wages, [the] widow and [the] orphan, and {the abusers of} [the] alien, and [yet] do not fear me," says Yahweh of hosts.

Colossians 4:1

Masters, grant your slaves justice and fairness, knowing that you also have a master in heaven.

Treasury of Scripture Knowledge

Summary

And when thou sendest him out free from thee, thou shalt not let him go away empty:

This is a most humane and merciful addition to the law in ex 21

Bible References

This is a most humane and merciful addition to the law in ex 21

Exodus 3:21
And I will give this people favor in the eyes of [the] Egyptians, {and then} when you go, you will not go empty-handed.
Leviticus 25:42
Because they [are] my servants whom I brought out from the land of Egypt, they shall not be sold {as a slave}.
Proverbs 3:27
Do not withhold good from its owner when it is in the power of your hand to do.
Jeremiah 22:13
Woe [to the one who] builds his house without righteousness, and his upper rooms without justice. His fellow countryman, he works for nothing, and he does not give to him his wages.
Malachi 3:5
"Then I will approach you for judgment, and I will be a swift witness against the sorcerers and against the adulterers, and against those who swear {falsely}, and against the oppressors of [the] hired worker [with his] wages, [the] widow and [the] orphan, and {the abusers of} [the] alien, and [yet] do not fear me," says Yahweh of hosts.
Colossians 4:1
Masters, grant your slaves justice and fairness, knowing that you also have a master in heaven.