2 Samuel 3:30

3:30 So Joab and Abishai his brother killed Abner, because he had killed their brother Asahel at Gibeon in the battle.
-World English Bible

Other Translation

3:30 So Joab and Abishai his brother slew Abner, because he had slain their brother Asahel at Gibeon in the battle.
-King James Version