2 Samuel 14:9

The iniquity be on me. The king had given a general promise to help the widow, but she wants to lead him on to a definite assurance that her son shall be pardoned. Less than this would not help Absalom's case. Instead, therefore, of withdrawing, she represents herself as dissatisfied, and pleads for full forgiveness; and as this would be a violation of the letter of the Levitical Law, in order to remove David's supposed scruples, she takes upon herself the penalty.