2 Samuel 3:28-30

Later on, when David heard what happened, he said, “Before GOD I and my kingdom are totally innocent of this murder of Abner son of Ner. Joab and his entire family will always be under the curse of this bloodguilt. May they forever be victims of crippling diseases, violence, and famine.” (Joab and his brother, Abishai, murdered Abner because he had killed their brother Asahel at the battle of Gibeon.)