“Please do not let my lord.” Abigail addresses David in the third person out of respect.
“sons of Belial.” This is a designation of sons of the Devil. [For more on sons of Belial, see commentary on 1 Sam. 2:12. For more on the unforgivable sin and children of the Devil, see commentary on Matt. 12:31].
“Nabal.” The word “Nabal” means “fool,” but there are several different words for “fool” in Hebrew. “Nabal” refers to a committed, unrepentant fool.