2 Samuel 3:27-29 New International Version - UK (NIVUK)
27 Now when Abner returned to Hebron, Joab took him aside into an inner chamber, as if to speak with him privately. And there, to avenge the blood of his brother Asahel, Joab stabbed him in the stomach, and he died.
28 Later, when David heard about this, he said, ‘I and my kingdom are for ever innocent before the Lord concerning the blood of Abner son of Ner. 29 May his blood fall on the head of Joab and on his whole family! May Joab’s family never be without someone who has a running sore or leprosy[a] or who leans on a crutch or who falls by the sword or who lacks food.’