Bilangan 35:19

35:19 The avenger ¹  of blood himself must kill the murderer; when he meets him, he must kill him.

Bilangan 35:21

35:21 or with enmity he strikes him with his hand and he dies, the one who struck him must surely be put to death, for he is a murderer. The avenger of blood must kill the murderer when he meets him.

Bilangan 35:27

35:27 and the avenger of blood finds him outside the borders of the town of refuge, and the avenger of blood kills the slayer, he will not be guilty of blood,

Bilangan 35:33

35:33 “You must not pollute the land where you live, for blood defiles the land, and the land cannot be cleansed of the blood that is shed there, except by the blood of the person who shed it.

[35:19]  ¹ tn The participle גֹּאֵל (go’el) is the one who protects the family by seeking vengeance for a crime. This is the same verb used for levirate marriages and other related customs.