When Abner returned to Hebron, Joab took him aside at the gate as if to speak privately with him. Joab then stabbed him ¹  in the abdomen and killed him, avenging the shed blood of his brother Asahel. ² 

But Asahel ¹  refused to turn aside. So Abner struck him in the abdomen with the back end of his ²  spear. The spear came out his back; Asahel ³  collapsed on the spot and died there right before Abner. ⁴  Everyone who now comes to the place where Asahel fell dead pauses in respect. ⁵ 

Amasa did not protect himself from the knife in Joab’s other hand, and Joab ¹  stabbed him in the abdomen, causing Amasa’s ²  intestines to spill out on the ground. There was no need to stab him again; the first blow was fatal. ³  Then Joab and his brother Abishai pursued Sheba son of Bicri.