'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.