2 Samuel 20:10

‘And if he pushed him of hatred or threw something at him lying in wait and as a result he died,

So when Abner returned to Hebron, Joab took him aside into the middle of the gate to speak with him privately, and there he struck him in the belly so that he died on account of the blood of Asahel his brother.

And Absalom set Amasa over the army in place of Joab. Now Amasa was the son of a man whose name was Ithra the Israelite, who went in to Abigail the daughter of Nahash, sister of Zeruiah, Joab’s mother.

But Abishai the son of Zeruiah helped him, and struck the Philistine and put him to death. Then the men of David swore to him, saying, “You shall not go out again with us to battle, so that you do not extinguish the lamp of Israel.”

“Now you also know what Joab the son of Zeruiah did to me, what he did to the two commanders of the armies of Israel, to Abner the son of Ner, and to Amasa the son of Jether, whom he killed; he also shed the blood of war in peace. And he put the blood of war on his belt about his waist, and on his sandals on his feet.

“And Yahweh will return his blood on his own head, because he fell upon two men more righteous and better than he and killed them with the sword, but my father David did not know it: Abner the son of Ner, commander of the army of Israel, and Amasa the son of Jether, commander of the army of Judah.

Then Ishmael the son of Nethaniah and the ten men who were with him arose and struck down Gedaliah the son of Ahikam, the son of Shaphan, with the sword and put to death the one whom the king of Babylon had appointed over the land.

Joab Strikes Amasa