Numbers 35:19

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

Numbers 35:24

35:24 then the community must judge between the slayer and the avenger of blood according to these decisions.

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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.