2 Samuel 16:5-7, 9-10

When King David came to Bahurim, a man named Shimei, the son of Gera, came out from there. He was of the family of Saul’s household and he was cursing continually as he came out. He threw stones at David and at all the servants of King David; yet all the people and all the warriors remained on his right and on his left. This is what Shimei said as he cursed: “Get out, get out, you man of bloodshed, you worthless and useless man!

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?’ ”