ESV: So Joab and Abishai his brother killed Abner, because he had put their brother Asahel to death in the battle at Gibeon.
NIV: (Joab and his brother Abishai murdered Abner because he had killed their brother Asahel in the battle at Gibeon.)
NASB: So Joab and his brother Abishai killed Abner because he had put their brother Asahel to death in the battle at Gibeon.
CSB: Joab and his brother Abishai killed Abner because he had put their brother Asahel to death in the battle at Gibeon.
NLT: So Joab and his brother Abishai killed Abner because Abner had killed their brother Asahel at the battle of Gibeon.
KJV: So Joab and Abishai his brother slew Abner, because he had slain their brother Asahel at Gibeon in the battle.
NKJV: So Joab and Abishai his brother killed Abner, because he had killed their brother Asahel at Gibeon in the battle.