1 Kings 2:5, 6, 31-33

“Now you yourself know what Joab son of Zeruiah did to me—what he did to the two commanders of Israel’s armies, Abner son of Ner and Amasa son of Jether. He killed them, shedding their blood in peacetime as if in battle, and with that blood he stained the belt around his waist and the sandals on his feet.

Deal with him according to your wisdom, but do not let his gray head go down to the grave in peace.

Then the king commanded Benaiah, “Do as he says. Strike him down and bury him, and so clear me and my whole family of the guilt of the innocent blood that Joab shed. The LORD will repay him for the blood he shed, because without my father David knowing it he attacked two men and killed them with the sword. Both of them—Abner son of Ner, commander of Israel’s army, and Amasa son of Jether, commander of Judah’s army—were better men and more upright than he. May the guilt of their blood rest on the head of Joab and his descendants forever. But on David and his descendants, his house and his throne, may there be the LORD’s peace forever.”