Thematic Bible: David forgives shimei

Therefore the king said to Shimei, “You shall not be put to death.” And so the king gave him his promise.

Then said [David's nephew] Abishai son of Zeruiah to the king, Why should this dead dog curse my lord the king? Let me go over and take off his head. The king said, What have I to do with you, you sons of Zeruiah? If he is cursing because the Lord said to him, Curse David, who then shall ask, Why have you done so? And David said to Abishai and to all his servants, Behold, my son, who was born to me, seeks my life. With how much more reason now may this Benjamite do it? Let him alone; and let him curse, for the Lord has bidden him to do it. read more.
It may be that the Lord will look on the iniquity done me and will recompense me with good for his cursing this day. So David and his men went by the road, and Shimei went along on the hillside opposite David and cursed as he went and threw stones and dust at him.

And you have with you Shimei son of Gera, the Benjamite of Bahurim, who cursed me with a grievous curse in the day when I went to Mahanaim. But he came down to meet me at the Jordan [on my return], and I swore to him by the Lord, saying, I will not put you to death with the sword. So do not hold him guiltless; for you are a wise man and know what you should do to him. His hoary head bring down to the grave with blood.