Now Abishai son of Zeruiah, the brother of Joab, was chief of the Thirty. With his spear he fought against three hundred men and killed them, and won a name beside the Three.
When the Ammonites saw that the Arameans fled, they likewise fled before Abishai, and entered the city. Then Joab returned from fighting against the Ammonites, and came to Jerusalem.
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.”
But Amasa did not notice the sword in Joab's hand; Joab struck him in the belly so that his entrails poured out on the ground, and he died. He did not strike a second blow. Then Joab and his brother Abishai pursued Sheba son of Bichri.