Thematic Bible: David chides joab for killing abner

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! 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!" So Joab and his brother Abishai killed Abner, because he had killed their brother Asahel in Gibeon during the battle. read more.
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.