Verses with the word revenger in the Old Testament (5 verses):

Numbers 35:19
The revenger of blood himself shall slay the murderer: when he meeteth him, he shall slay him.

Numbers 35:21
Or in enmity smite him with his hand, that he die: he that smote him shall surely be put to death; for he is a murderer: the revenger of blood shall slay the murderer, when he meeteth him.

Numbers 35:24
Then the congregation shall judge between the slayer and the revenger of blood according to these judgments:

Numbers 35:25
And the congregation shall deliver the slayer out of the hand of the revenger of blood, and the congregation shall restore him to the city of his refuge, whither he was fled: and he shall abide in it unto the death of the high priest, which was anointed with the holy oil.

Numbers 35:27
And the revenger of blood find him without the borders of the city of his refuge, and the revenger of blood kill the slayer; he shall not be guilty of blood: