'Avenger' in the Bible

Out of the mouth of babes and sucklings hast thou ordained strength because of thine enemies, that thou mightest still the enemy and the avenger.

As an avenger of blood, he remembers them; he has not forgotten the cry of the afflicted.

For the voice of him that reproacheth and blasphemeth; by reason of the enemy and avenger.

O Lord our God, You answered them;You were a forgiving God to them,And yet an avenger of their evil deeds.