2 Samuel 3:28-31

3:28 When David later heard about this, he said, “I and my kingdom are forever innocent before the Lord of the shed blood of Abner son of Ner! 3:29 May his blood whirl over the head of Joab and the entire house of his father! May the males of Joab’s house never cease to have someone with a running sore or a skin disease or one who works at the spindle or one who falls by the sword or one who lacks food!”

3:30 So Joab and his brother Abishai killed Abner, because he had killed their brother Asahel in Gibeon during the battle.

3:31 David instructed Joab and all the people who were with him, “Tear your clothes! Put on sackcloth! Lament before Abner!” Now King David followed behind the funeral bier.