Kabbalah к Шмуэль Б 8:15
וַיִּמְלֹ֥ךְ דָּוִ֖ד עַל־כָּל־יִשְׂרָאֵ֑ל וַיְהִ֣י דָוִ֗ד עֹשֶׂ֛ה מִשְׁפָּ֥ט וּצְדָקָ֖ה לְכָל־עַמּֽוֹ׃
И воцарился Давид над всем Израилем; и Давид исполнил справедливость и праведность по всему своему народу.
Zohar
Another explanation is that "The king by justice establishes the land" refers to King David, as it is written, "And David reigned over all Yisrael; and David executed judgment and righteousness to all his people" (II Shmuel 8:15). He established the land, and by his merit, it stood, "but he who exacts gifts overthrows it" refers to Rechav'am.
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