1 Kings 2:5-6, 31-33

“Now you also know what Joab the son of Zeruiah did to me, what he did to the two commanders of the armies of Israel, to Abner the son of Ner, and to Amasa the son of Jether, whom he killed; he also shed the blood of war in peace. And he put the blood of war on his belt about his waist, and on his sandals on his feet. So act according to your wisdom, and do not let his gray hair go down to Sheol in peace.

The king said to him, “Do as he has spoken and fall upon him and bury him, that you may remove from me and from my father’s house the blood which Joab shed without cause. The LORD will return his blood on his own head, because he fell upon two men more righteous and better than he and killed them with the sword, while my father David did not know it: Abner the son of Ner, commander of the army of Israel, and Amasa the son of Jether, commander of the army of Judah. So shall their blood return on the head of Joab and on the head of his descendants forever; but to David and his descendants and his house and his throne, may there be peace from the LORD forever.”