2 Samuel 3:28-31

28When David heard about it afterward, he said, “I and my kingdom are innocent before Adonai forever from the blood of Abner son of Ner.

29May it whirl on Joab’s head and on all his father’s house. May the house of Joab never be without someone with discharge or tza'arat, lame or one fallen by the sword or one who lacks food.”

30So Joab and Abishai his brother killed Abner because he had killed their brother Asahel at Gibeon in battle.

31Then David said to Joab and to all the people who were with him, “Rend your clothes, gird with sackcloth, and lament before Abner.” King David walked behind the platform.