Absalom had made Amasa captain of the army instead of Joab. Amasa was the son of a man named Jether the Ishmaelite. Amasa’s mother was Abigail daughter of Nahash and sister of Zeruiah, Joab’s mother.
David said, “This does not concern you, sons of Zeruiah! Today you’re against me! No one will be put to death in Israel today. Today I know I am king over Israel!”
Joab son of Zeruiah and David’s men also went there and met Abner and Ish-Bosheth’s men at the pool of Gibeon. Abner’s group sat on one side of the pool; Joab’s group sat on the other.
Abishai brother of Joab was the captain of the Three. Abishai fought three hundred soldiers with his spear and killed them. He became as famous as the Three
David asked Ahimelech the Hittite and Abishai son of Zeruiah, Joab’s brother, “Who will go down into Saul’s camp with me?” Abishai answered, “I’ll go with you.”