2 Samuel 3:30
King James Version
“So Joab and Abishai his brother slew Abner, because he had slain their brother Asahel at Gibeon in the battle.”
Context
27And when Abner was returned to Hebron, Joab took him aside in the gate to speak with him quietly, and smote him there under the fifth that he died, for the blood of Asahel his brother.
28And afterward when David heard he said, I and my kingdom guiltless before the LORD for ever from the blood of Abner the son of Ner:
29Let it rest on the head of Joab, and on all his father’s house; and let there not fail from the house of Joab one that hath an issue, or that is a leper, or that leaneth on a staff, or that falleth on the sword, or that lacketh bread.
30So Joab and Abishai his brother slew Abner, because he had slain their brother Asahel at Gibeon in the battle.
31And David said to Joab, and to all the people that with him, Rend your clothes, and gird you with sackcloth, and mourn before Abner. And king David followed the bier.
32And they buried Abner in Hebron: and the king lifted up his voice, and wept at the grave of Abner; and all the people wept.
33And the king lamented over Abner, and said, Died Abner as a fool dieth?