When Abner returned to Hebron, Joab pulled him aside into the gateway, as if to speak to him privately, and there Joab stabbed him in the stomach. So Abner died on account of the blood of Joab's brother Asahel.

Numbers 35:20
Likewise, if anyone maliciously pushes another or intentionally throws an object at him and kills him,

2 Samuel 2:22
Once again, Abner warned Asahel, "Stop chasing me. Why should I strike you to the ground? How could I show my face to your brother Joab?"

2 Samuel 2:23
But Asahel refused to turn away; so Abner thrust the butt of his spear into his stomach, and it came out his back, and he fell dead on the spot. And every man paused when he came to the place where Asahel had fallen and died.

2 Samuel 3:26
As soon as Joab had left David, he sent messengers after Abner, who brought him back from the well of Sirah; but David was unaware of it.

2 Samuel 3:28
Afterward, David heard about this and said, "I and my kingdom are forever guiltless before the LORD concerning the blood of Abner son of Ner.

2 Samuel 4:1
Now when Ish-bosheth son of Saul heard that Abner had died in Hebron, he lost courage, and all Israel was dismayed.

2 Samuel 13:26
"If not," said Absalom, "please let my brother Amnon go with us." "Why should he go with you?" the king asked.

2 Samuel 19:13
And say to Amasa, 'Aren't you my flesh and blood? May God punish me, and ever so severely, if from this time you are not the commander of my army in place of Joab!'"

2 Samuel 20:9
"Are you well, my brother?" Joab asked Amasa. And with his right hand Joab grabbed Amasa by the beard to kiss him.

2 Samuel 20:10
Amasa was not on guard against the dagger in Joab's hand, and Joab stabbed him in the stomach and spilled out his intestines on the ground. And Joab did not need to strike him again, for Amasa was dead. Then Joab and his brother Abishai pursued Sheba son of Bichri.

1 Kings 2:5
Moreover, you know what Joab son of Zeruiah did to me--what he did to Abner son of Ner and Amasa son of Jether, the two commanders of the armies of Israel. He killed them in peacetime to avenge the blood of war. He stained with the blood of war the belt around his waist and the sandals on his feet.

1 Kings 2:32
The LORD will bring his bloodshed back upon his own head, for without the knowledge of my father David he struck down two men more righteous and better than he when he put to the sword Abner son of Ner, commander of Israel's army, and Amasa son of Jether, commander of Judah's army.

Jeremiah 41:2
Then Ishmael son of Nethaniah and the ten men who were with him got up and struck down Gedaliah son of Ahikam, the son of Shaphan, with the sword, killing the one whom the king of Babylon had appointed to govern the land.

And 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 rib, that he died, for the blood of Asahel his brother.