2 Samuel 3:27

3:27 When Abner returned to Hebron, Joab took him aside at the gate as if to speak privately with him. Joab then stabbed him in the abdomen and killed him, avenging the shed blood of his brother Asahel.

2 Samuel 11:15-21

11:15 In the letter he wrote: “Station Uriah in the thick of the battle and then withdraw from him so he will be cut down and killed.”

11:16 So as Joab kept watch on the city, he stationed Uriah at the place where he knew the best enemy soldiers were. 11:17 When the men of the city came out and fought with Joab, some of David’s soldiers fell in battle. Uriah the Hittite also died.

11:18 Then Joab sent a full battle report to David. 11:19 He instructed the messenger as follows: “When you finish giving the battle report to the king, 11:20 if the king becomes angry and asks you, ‘Why did you go so close to the city to fight? Didn’t you realize they would shoot from the wall? 11:21 Who struck down Abimelech the son of Jerub-Besheth? Didn’t a woman throw an upper millstone down on him from the wall so that he died in Thebez? Why did you go so close to the wall?’ just say to him, ‘Your servant Uriah the Hittite is also dead.’”

2 Samuel 20:9-10

20:9 Joab said to Amasa, “How are you, my brother?” With his right hand Joab took hold of Amasa’s beard as if to greet him with a kiss. 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.