Deuteronomy 19:6

lest the avenger of blood pursue the manslayer, while his heart is hot, and overtake him, because the way is long, and strike him mortally; whereas he was not worthy of death, inasmuch as he didn't hate him in time past.

Numbers 35:12

The cities shall be to you for refuge from the avenger, that the manslayer not die, until he stands before the congregation for judgment.

Deuteronomy 21:22

If a man have committed a sin worthy of death, and he be put to death, and you hang him on a tree;

Joshua 20:5

If the avenger of blood pursue after him, then they shall not deliver up the manslayer into his hand; because he struck his neighbor unintentionally, and didn't hate him before.

2 Samuel 14:7

Behold, the whole family has risen against your handmaid, and they say, 'Deliver him who struck his brother, that we may kill him for the life of his brother whom he killed, and so destroy the heir also.' Thus they would quench my coal which is left, and would leave to my husband neither name nor remainder on the surface of the earth."

Jeremiah 26:15-16

Only know for certain that, if you put me to death, you will bring innocent blood on yourselves, and on this city, and on its inhabitants; for of a truth Yahweh has sent me to you to speak all these words in your ears.

Treasury of Scripture Knowledge

Summary

Lest the avenger of the blood pursue the slayer, while his heart is hot, and overtake him, because the way is long, and slay him; whereas he was not worthy of death, inasmuch as he hated him not in time past.

In time past

General references

Bible References

The avenger

Numbers 35:12
The cities shall be to you for refuge from the avenger, that the manslayer not die, until he stands before the congregation for judgment.
Joshua 20:5
If the avenger of blood pursue after him, then they shall not deliver up the manslayer into his hand; because he struck his neighbor unintentionally, and didn't hate him before.
2 Samuel 14:7
Behold, the whole family has risen against your handmaid, and they say, 'Deliver him who struck his brother, that we may kill him for the life of his brother whom he killed, and so destroy the heir also.' Thus they would quench my coal which is left, and would leave to my husband neither name nor remainder on the surface of the earth."

Not worthy

Deuteronomy 21:22
If a man have committed a sin worthy of death, and he be put to death, and you hang him on a tree;
Jeremiah 26:15
Only know for certain that, if you put me to death, you will bring innocent blood on yourselves, and on this city, and on its inhabitants; for of a truth Yahweh has sent me to you to speak all these words in your ears.

In time past

Deuteronomy 19:4
This is the case of the manslayer, that shall flee there and live: whoever kills his neighbor unawares, and didn't hate him in time past;

General references

Numbers 35:19
The avenger of blood shall himself put the murderer to death: when he meets him, he shall put him to death.