Kings III 2:4

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.

Kings III 2:4 In-Context

2 but be thou strong, and shew thyself a man;
3 and keep the charge of the Lord thy God, to walk in his ways, to keep the commandments and the ordinances and the judgments which are written in the law of Moses; that thou mayest understand what thou shalt do in all things that I command thee:
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.

Footnotes 1

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