NET

23 But Asahel refused to turn aside. So Abner struck him in the abdomen with the back end of his spear. The spear came out his back; Asahel collapsed on the spot and died there right before Abner. Everyone who came to the place where Asahel fell dead paused in respect.

Darby

23 But he refused to turn aside; therefore Abner with the hinder end of the spear smote him in the belly^D1938, so that the spear came out behind him; and he fell down there, and died in the same place. And it came to pass, that as many as came to the place where Asahel fell down and died stood still.

Darby Bible Notes

belly - Or 'under the fifth [rib].' so chs. 3.27; 4.6; 20.10.

KJV

23 Howbeit he refused to turn aside: wherefore Abner with the hinder end of the spear smote him under the fifth [rib], that the spear came out behind him; and he fell down there, and died in the same place: and it came to pass, [that] as many as came to the place where Asahel fell down and died stood still.