Kings III 9:5

5 then will I establish the throne of thy kingdom in Israel for ever, as I spoke to David thy father, saying, There shall not fail thee a man to rule in Israel.

Kings III 9:5 In-Context

3 And the Lord said to him, I have heard the voice of thy prayer, and thy supplication which thou madest before me: I have done for thee according to all thy prayer: I have hallowed this house which thou hast built to put my name there for ever, and mine eyes and my heart shall be there always.
4 And if thou wilt walk before me as David thy father walked, in holiness of heart and uprightness, and so as to do according to all that I commanded him, and shalt keep my ordinances and my commandments:
5 then will I establish the throne of thy kingdom in Israel for ever, as I spoke to David thy father, saying, There shall not fail thee a man to rule in Israel.
6 But if ye or your children do in any wise revolt from me, and do not keep my commandments and my ordinances, which Moses set before you, and ye go and serve other gods, and worship them:
7 then will I cut off Israel from the land which I have given them, and this house which I have consecrated to my name I will cast out of my sight; and Israel shall be a desolation and a by-word to all nations.

Footnotes 1

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