English Standard Version
So Joab and Abishai his brother killed Abner, because he had put their brother Asahel to death in the battle at Gibeon.New International Version
(Joab and his brother Abishai murdered Abner because he had killed their brother Asahel in the battle at Gibeon.)Catholic Public Domain Version
And so, Joab and his brother Abishai killed Abner, because he had killed their brother Asahel at Gibeon, during the battle