Numbers 35:19

The blood avenger himself will put the killer to death; he must put him to death when meeting him.

Numbers 35:21

or if he hits him in hostility with his hand, and he dies, the one that struck him will put to death the killer when meeting him.

Deuteronomy 19:6

[He does this] lest the avenger of blood might pursue after the killer, because {he is hot with anger} and he overtakes him, because it is a long distance [to the city of refuge], and [so] {he kills him}, but {he did not deserve a death sentence}, because he [was] not hating him {before}.

Deuteronomy 19:12

then the elders of his city shall send and take him from there, and they shall give him into the hand of the avenger of blood, and he shall be put to death.

Joshua 20:3

Anyone who kills a person by accident or unintentionally may flee there; they will be for yourselves a refuge from the avenger of blood.

Joshua 20:5

And if the avenger of blood pursues after him, they will not hand over the killer into his hand, because he killed his neighbor unintentionally, and {he did not hate him previously}.

Numbers 35:12

The cities will be to you a refuge from a redeemer, so that the killer will not die until he stands before the community for judgment.

Numbers 35:24

then the community will judge between the striker and between the blood avenger according to these ordinances.

Numbers 35:27

and the blood avenger finds him outside the territory of the city of his refuge, and the blood avenger kills the killer, {he will not be guilty of blood}

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 will be to you a refuge from a redeemer, so that the killer will not die until he stands before the community for judgment.
Deuteronomy 19:6
[He does this] lest the avenger of blood might pursue after the killer, because {he is hot with anger} and he overtakes him, because it is a long distance [to the city of refuge], and [so] {he kills him}, but {he did not deserve a death sentence}, because he [was] not hating him {before}.
Joshua 20:3
Anyone who kills a person by accident or unintentionally may flee there; they will be for yourselves a refuge from the avenger of blood.