2 Samuel 3:24

20 When Abner and twenty of his men came to David at Hebron, David held a feast for them.

21 Then Abner said to David, “Let me go at once, and I will gather all Israel to my lord the king, that they may make a covenant with you, and that you may rule over all that your heart desires.” So David dismissed Abner, and he went in peace.

22 Just then David’s soldiers and Joab returned from a raid, bringing with them a great plunder. But Abner was not with David in Hebron because David had sent him on his way in peace.

23 When Joab and all his troops arrived, he was informed, “Abner son of Ner came to see the king, who sent him on his way in peace.”

24 So Joab went to the king and said, “What have you done? Look, Abner came to you. Why did you dismiss him? Now he is getting away!

25 Surely you realize that Abner son of Ner came to deceive you and to track your movements and all that you are doing.”

26 As soon as Joab had left David, he sent messengers after Abner, who brought him back from the well of Sirah; but David was unaware of it.

27 When Abner returned to Hebron, Joab pulled him aside into the gateway, as if to speak to him privately, and there Joab stabbed him in the stomach. So Abner died on account of the blood of Joab’s brother Asahel.

28 Afterward, David heard about this and said, “I and my kingdom are forever guiltless before the LORD concerning the blood of Abner son of Ner.

Read all of 2 Samuel 3