'Avenger' in the Bible

for of God it is a ministrant to thee for good; and if that which is evil thou mayest do, be fearing, for not in vain doth it bear the sword; for of God it is a ministrant, an avenger for wrath to him who is doing that which is evil.

that no one go beyond and defraud in the matter his brother, because an avenger is the Lord of all these, as also we spake before to you and testified,