TSK · 2 Samuel 23:18

The three sons of Zeruiah were there– Joab, Abishai, and Asahel.(Now Asahel was as quick on his feet as one of the gazelles in the field.)

He put his brother Abishai in charge of the rest of the army and they were deployed against the Ammonites.

David then sent out the army– a third under the leadership of Joab, a third under the leadership of Joab’s brother Abishai son of Zeruiah, and a third under the leadership of Ittai the Gittite. The king said to the troops,“I too will indeed march out with you.”

Their sisters were Zeruiah and Abigail. Zeruiah’s three sons were Abshai, Joab, and Asahel.

Although an assailant may overpower one person, two can withstand him. Moreover, a three-stranded cord is not quickly broken.