2 Samuel 17:25

17:25 Absalom had made Amasa general in command of the army in place of Joab. (Now Amasa was the son of an Israelite man named Jether, who had married Abigail the daughter of Nahash and sister of Zeruiah, Joab’s mother.)

2 Samuel 20:10

20:10 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 Bicri.