'Avenging' in the Bible

So now, my lord, as the Lord lives, and as your soul lives, since the Lord has prevented you from shedding blood, and from avenging yourself by your own hand, now then let your enemies and those who seek to do evil to my lord, be as [self-destructive as] Nabal.

And blessed be your discretion and discernment, and blessed be you, who has kept me from bloodshed this day and from avenging myself by my own hand.

Now you also know what Joab the son of Zeruiah [my sister] did to me, and what he did to the two commanders of the armies of Israel, to Abner the son of Ner and to Amasa the son of Jether, [both of] whom he murdered; avenging the blood of war in [a time of] peace. And he put the [innocent] blood of war [of Abner and Amasa] on his belt that was around his waist, and on his sandals on his feet.

Then the Lord commanded the [avenging] angel, and he put his sword back into its sheath.

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

The Lord is a jealous and avenging God [protecting and demanding what is rightfully and uniquely His];The Lord avenges and He is full of wrath.The Lord takes vengeance on His adversaries,And He reserves wrath for His enemies.