II Samuel 16:5-7, 9-10

Now when King David came to Bahurim, there was a man from the family of the house of Saul, whose name was Shimei the son of Gera, coming from there. He came out, cursing continuously as he came. And he threw stones at David and at all the servants of King David. And all the people and all the mighty men were on his right hand and on his left. Also Shimei said thus when he cursed: “Come out! Come out! You bloodthirsty man, you rogue!

Then Abishai the son of Zeruiah said to the king, “Why should this dead dog curse my lord the king? Please, let me go over and take off his head!” But the king said, “What have I to do with you, you sons of Zeruiah? So let him curse, because the LORD has said to him, ‘Curse David.’ Who then shall say, ‘Why have you done so?’ ”