Absalom put Amasa in Joab's place as commander of the army. Amasa's father was Ithra from the family of Ishmael, and his mother was Abigal, the daughter of Nahash and the sister of Joab's mother Zeruiah.
David said, “Abishai, whatever will I do with you and your brother Joab? Is it your job to tell me who has done wrong? I've been made king of all Israel today, and no one will be put to death!”
Meanwhile, Joab the son of Zeruiah was leading David's soldiers, and the two groups met at the pool in Gibeon. Abner and his men sat down on one side of the pool, while Joab and his men sat on the other side.
Joab's brother Abishai was the leader of the Thirty Warriors, and in one battle he killed three hundred men with his spear. He was just as famous as the Three Warriors