וַֽאעַנֶּ֛ה אֶת־זֶ֥רַע דָּוִ֖ד לְמַ֣עַן זֹ֑את אַ֖ךְ לֹ֥א כָל־הַיָּמִֽים׃ (ס)
J’humilierai de la sorte la postérité de David, non cependant pour toujours."
Mishneh Torah, Kings and Wars
The monarchy remains with the House of David forever, as it says, “your throne shall be established forever” (II Samuel 7:16). In contrast, if a king from (any of the other tribes of) Israel is appointed, the monarchy will cease from his House, as it says with regard to Jeraboam, “but not for all the days” (I Kings 11:39).
Mishneh Torah, Kings and Wars
Should a prophet install a king from any of the other Tribes of Israel, and that king follows in the ways of the Torah and observes the Commandments, and fights the Wars of G-d, he, too, is a king and all the Commandments of the King are applicable to him. This, even though the “essential” monarchy belongs to David and from his children there will be kings. For we see that Achiya the Shilonite appointed Jeraboam and said to him, “And it will be, if you listen to all that I command you…and I shall build for you a sure house as I built for David…” (I Kings 11:38). And Achiya said to him, “And to his son, I shall give one tribe, so that it shall be a remembrance for David my servant for all days before me in Jerusalem” (I Kings 11:39).