When the news came to Joab—for Joab had supported Adonijah though he had not supported Absalom—Joab fled to the tent of the Lord and grasped the horns of the altar.
Now Absalom had set Amasa over the army in the place of Joab. Amasa was the son of a man named Ithra the Ishmaelite, who had married Abigal daughter of Nahash, sister of Zeruiah, Joab's mother.
And David divided the army into three groups: one third under the command of Joab, one third under the command of Abishai son of Zeruiah, Joab's brother, and one third under the command of Ittai the Gittite. The king said to the men, “I myself will also go out with you.”