2 Samuel 16:9-10

Then 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.” But 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?’ ”