Then answered David and said to Ahimelech the Hittite, and to Abishai the son of Zeruiah, brother to Joab, saying, Who will go down with me to Saul to the camp? Abishai said, I will go down with you.
A passage in one of the Psalms seems applicable to what happened here, although the usual interpretation applies it to the destruction of the army of Sennacherib.