'Avenger' in the Bible

They are to serve as cities of refuge from a blood avenger in order to keep the inadvertent killer from dying until he has stood trial in the presence of the community.

The blood avenger himself is to execute the murderer. When he meets him, the blood avenger is to put him to death.

or if he struck him with his hand out of hatred so that he died, then the killer is certainly to be put to death for murder. The avenger of blood is to put him to death when he meets him."

then the community is to judge between the inadvertent killer and the blood avenger, following these ordinances.

The community is to release the inadvertent killer from the blood avenger and return him to the town of refuge where he had fled. He is to live there until the High Priest dies, who will have anointed him with holy oil.

and the blood avenger finds him outside the town of refuge where he had fled and kills him, the blood avenger is not to be found guilty of murder.