"And see, you have with you Shimei the son of Gera, a Benjamite from Bahurim, who cursed me with a malicious curse in the day when I went to Mahanaim. But he came down to meet me at the Jordan, and I swore to him by the LORD, saying, "I will not put you to death with the sword.'
1 Kings 2:8
Surrounding context
2:7 "But show kindness to the sons of Barzillai the Gileadite, and let them be among those who eat at your table, for so they came to me when I fled from Absalom your brother.
2:8 "And see, you have with you Shimei the son of Gera, a Benjamite from Bahurim, who cursed me with a malicious curse in the day when I went to Mahanaim. But he came down to meet me at the Jordan, and I swore to him by the LORD, saying, "I will not put you to death with the sword.'
2:9 Now therefore, do not hold him guiltless, for you are a wise man and know what you ought to do to him; but bring his gray hair down to the grave with blood."