'Avenger' in the Bible

[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}.

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.