Parallel
2 Samuel 3:30
King James Version (1769 Blayney revision, with Apocrypha) · Berean Standard Bible
So Joab and Abishai his brother slew Abner, because he had slain their brother Asahel at Gibeon in the battle.
(Joab and his brother Abishai murdered Abner because he had killed their brother Asahel in the battle at Gibeon.)