Jamieson-Fausset-Brown Bible Commentary

They shall offer . . . each prince on his day, &c.--Eastern princes were accustomed anciently, as they are in Persia still on a certain yearly festival, to sit upon their thrones in great state, when the princes and nobles, from all parts of their dominions, appear before them with tributary presents, which form a large proportion of their royal revenue. And in the offering of all gifts or presents to great personages, every article is presented singly and with ostentatious display. The tabernacle being the palace of their great King, as well as the sanctuary of their God, the princes of Israel may be viewed, on the occasion under notice, as presenting their tributary offerings, and in the same manner of successive detail, which accords with the immemorial usages of the East. A day was set apart for each, as much for the imposing solemnity and splendor of the ceremony, as for the prevention of disorder and hurry; and it is observable that, in the order of offering, regard was paid to priority not of birth, but of rank and dignity as they were ranked in the camp--beginning at the east, proceeding to the south, then to the west, and closing with the north, according to the course of the sun.