1 Kings 2:5-9

5“Now you also know what Joab the 1son of Zeruiah did to me, what he did to the two commanders of the armies of Israel, to 2Abner the son of Ner, and to 3Amasa the son of Jether, whom he killed; he also 4shed the blood of war in peace. And he put the blood of war on his belt 5about his waist, and on his sandals 6on his feet. 67So act according to your wisdom, and do not let his gray hair go down to 8Sheol in peace. 7But 9show kindness to the sons of Barzillai the Gileadite, and 10let them be among those who eat at your table; 11for they 12assisted me when I fled from Absalom your brother. 8Behold, 13there is with you Shimei the son of Gera the Benjamite, of Bahurim; now it was he who cursed me with a 14violent curse on the day I went to Mahanaim. But when 15he came down to me at the Jordan, I swore to him by the Lord, saying, ‘I will not put you to death with the sword.’ 9Now therefore, do not let him go unpunished, 16for you are a wise man; and you will know what you ought to do to him, and you will bring his gray hair down to 17Sheol with blood.”