1 Kings 2:8-9

8“And remember, you have with you Shimei son of Gera, the Benjamite from Bahurim, who called down bitter curses on me the day I went to Mahanaim. When he came down to meet me at the Jordan, I swore to him by the Lord: ‘I will not put you to death by the sword.’

9But now, do not consider him innocent. You are a man of wisdom; you will know what to do to him. Bring his gray head down to the grave in blood.”