NET

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

Darby

10 And Amasa had taken no notice of the sword that was in Joab's hand: so he smote him with it in the belly and shed out his bowels to the ground, and struck him not again; and he died. And Joab and Abishai his brother pursued after Sheba the son of Bichri.

KJV

10 But Amasa took no heed to the sword that [was] in Joab's hand: so he smote him therewith in the fifth [rib], and shed out his bowels to the ground, and struck him not again; and he died. So Joab and Abishai his brother pursued after Sheba the son of Bichri.