Musar על יהושע 2:1

I have already explained how all the attachment to G–d is achieved by means of Torah, and how all the "crowns" have as their purpose to further that attachment. The "crown" of Royalty may therefore be viewed as conferred due to the Torah. The tribe of Levi, which represents the "crown" of Priesthood, is described in Deuteronomy 33,10 as performing the function: יורו משפטיך ליעקב ותורתך לישראל, "They will instruct Jacob in Your laws and Israel in Your Torah." Clearly, this "crown" too is conferred thanks to the Torah. Concerning the Kingdom of the house of David, we find that our sages comment on the verse in Samuel I 16, 18: וה' עמו "G–d was with him," by remarking that the שכינה accompanied David wherever he went. The "crown" of Royalty is part of the "crown" of the Priesthood since the Kingdom of the seed of Yehudah was rooted in Tamar the daughter of Shem, who had been a High Priest already in the days of Abraham (an alternate name for Malki Tzedek mentioned in Genesis 14,18, as per Nedarim 32). When Israel later on sent spies to the land of Canaan prior to conquering it under the leadership of Joshua, the latter sent out Pinchas and Caleb. Caleb was from the tribe of Yehudah who represented Royalty, whereas Pinchas represented the Priesthood. (Cf. Bamidbar Rabbah 16, 4 commenting on Joshua 2, 1) Something of a similar nature will occur in the future when the prophet Elijah will represent the Priesthood before the arrival of the Messiah, and the Messiah will be Royalty incarnate. Pinchas is identified with the prophet Elijah.