Charles Ellicott Commentary 1 Kings 2:8

"And, behold, there is with thee Shimei the 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, and I sware to him by Jehovah, saying, I will not put thee to death with the sword." — 1 Kings 2:8 (ASV)

You have with you Shimei.—The most ungenerous charge is the virtual withdrawal of the pardon, freely granted to Shimei long before (2 Samuel 19:18–23). It is, perhaps, partly dictated by policy; for the notice of Shimei (2 Samuel 16:5–8; 2 Samuel 19:17) shows that he was powerful, and that he assumed a dangerous championship of the fallen house of Saul. But there are unmistakable traces of the old grudge rankling in David’s heart, reminding us of the bitterness of such psalms as Psalm 69.