2 Samuel 16:9-11

9Then Abishai [David’s nephew], the son of Zeruiah, said to the king, “Why should this dead dog (despicable person) curse my lord the king? Let me go over and take off his head.”

10But the king said, “What business is this of yours, O sons of Zeruiah? If Shimei is cursing because the Lord said to him, ‘Curse David,’ then who should say, ‘Why have you done so?’ ”

11Then David said to Abishai and to all his servants, “Look, my son [Absalom] who came from my own body, is seeking my life; how much more [reason] now [does] this Benjamite [have to curse me]? Let him alone and let him curse, for [it could be that] the Lord has told him [to do it].