2 Samuel 3:28-31

28Later, David heard about what Joab had done. He said, ‘The Lord knows this: I and the people of my kingdom are not guilty of Abner's murder.

29I pray that Joab and all his father's family will pay for this murder! May God punish his descendants for ever! May somebody always have sores or leprosy. May there be men who are not brave enough to fight, men who die in battle, or people who have no food to eat!’

30That is how Joab and his brother Abishai killed Abner. They killed him because he had killed their brother Asahel in the battle at Gibeon.

31David said to Joab and to all the people who were with him, ‘Tear your clothes! Wear sackcloth to show that you are sad! Weep because of Abner's death.’ King David himself walked behind the men who carried Abner's dead body.