Kings III 2:6

6 Therefore thou shalt deal according to thy wisdom, and thou shalt not bring down his grey hairs in peace to the grave.

Kings III 2:6 In-Context

4 that the Lord may confirm his word which he spoke, saying, If thy children shall take heed to their way to walk before me in truth with all their heart, , saying, there shall not fail thee a man on the throne of Israel.
5 Moreover thou knowest all that Joab the son of Saruia did to me, what he did to the two captains of the forces of Israel, to Abenner the son of Ner, and to Amessai the son of Jether, that he slew them, and shed the blood of war in peace, and put innocent blood on his girdle that was about his loins, and on his sandal that was on his foot.
6 Therefore thou shalt deal according to thy wisdom, and thou shalt not bring down his grey hairs in peace to the grave.
7 But thou shalt deal kindly with the sons of Berzelli the Galaadite, and they shall be among those that eat at thy table; for thus they drew nigh to me when I fled from the face of thy brother Abessalom.
8 And, behold, with thee Semei the son of Gera, a Benjamite of Baurim: and he cursed me with a grievous curse in the day when I went into the camp; and he came down to Jordan to meet me, and I swore to him by the Lord, saying, I will not put thee to death with the sword.

Footnotes 1

The Brenton translation of the Septuagint is in the public domain.