2 Samuel 16:9-11
9 Then Abishai son of Zeruiah said to the king, “Why should this dead dog curse my lord the king? Let me go over and cut off his head.”
10 But the king said, “What do you and I have in common, you sons of Zeruiah? If he is cursing because the Lord said to him, ‘Curse David,’ who can ask, ‘Why do you do this?’”
11 David then said to Abishai and all his officials, “My son, who is of my own flesh, is trying to take my life. How much more, then, this Benjamite! Leave him alone; let him curse, for the Lord has told him to.