'Avenging' in the Bible

I will bring on you an avenging sword, a covenant vengeance. Although you will gather together into your cities, I will send pestilence among you and you will be given into enemy hands.

When Abner returned to Hebron, Joab took him aside at the gate as if to speak privately with him. Joab then stabbed him in the abdomen and killed him, avenging the shed blood of his brother Asahel.

The Lord is a zealous and avenging God; the Lord is avenging and very angry. The Lord takes vengeance against his foes; he sustains his rage against his enemies.