Numbers 35:19

The blood avenger shall himself put the murderer to death; he shall put him to death when he meets him.

Numbers 35:21

or if, in enmity, he struck the victim down with his hand, and he died, the one that struck the victim shall certainly be put to death; he is a murderer. The blood avenger shall put the murderer to death when he meets him.

Deuteronomy 19:6

otherwise the avenger of blood might pursue the offender in the heat of anger, and overtake him, because it is a long way, and take his life, even though he did not deserve to die, since he did not hate his neighbor beforehand.

Deuteronomy 19:12

then the elders of his own city shall send for him and have him taken back from there and turn him over to the avenger of blood, so that he may be put to death.

Joshua 20:3

so that the person (manslayer) who kills any person unintentionally, without premeditation, may flee there, and they shall be your refuge from the blood avenger.

Joshua 20:5

If the blood avenger pursues him, they shall not hand the offender (manslayer) over to him, because he killed his neighbor unintentionally and without premeditation and did not hate him beforehand.

Numbers 35:12

The cities shall be to you as a refuge from the avenger, so that the one who has caused the death of another will not be killed until he has had a [fair] trial before the congregation.

Numbers 35:24

then the congregation shall judge between the offender and the blood avenger according to these ordinances.

Numbers 35:27

and the blood avenger finds him outside the border of his city of refuge and kills the offender, the blood avenger will not be guilty of murder,

Treasury of Scripture Knowledge

Summary

The revenger of blood himself shall slay the murderer: when he meeteth him, he shall slay him.

Bible References

General references

Numbers 35:12
The cities shall be to you as a refuge from the avenger, so that the one who has caused the death of another will not be killed until he has had a [fair] trial before the congregation.
Deuteronomy 19:6
otherwise the avenger of blood might pursue the offender in the heat of anger, and overtake him, because it is a long way, and take his life, even though he did not deserve to die, since he did not hate his neighbor beforehand.
Joshua 20:3
so that the person (manslayer) who kills any person unintentionally, without premeditation, may flee there, and they shall be your refuge from the blood avenger.