11 The Old Law, inspired by God and promulgated by Moses, set up a priesthood, which was, in this manner, of divine institution; and determined for it every detail of its duty, residence and rite. It would seem that God, in His great care for them, wished to impress upon the still primitive mind of the Jewish people one great central idea. This idea throughout the history of the chosen people, was to shed its light over all events, laws, ranks and offices: the idea of sacrifice and priesthood. These were to become, through faith in the future Messias, a source of hope, glory, power and spiritual liberation. The temple of Solomon, astonishing in richness and splendor, was still more wonderful in its rites and ordinances. Erected to the one true God as a tabernacle of the divine Majesty upon earth, it was also a sublime poem sung to that sacrifice and that priesthood, which, though type and symbol, was still so august, that the sacred figure of its High Priest moved the conqueror Alexander the Great, to bow in reverence; and God Himself visited His wrath upon the impious king Balthasar because he made revel with the sacred vessels of the temple. Yet that ancient priesthood derived its greatest majesty and glory from being a foretype of the Christian priesthood; the priesthood of the New and eternal Covenant sealed with the Blood of the Redeemer of the world, Jesus Christ, true God and true Man.
Source: Ad Catholici Sacerdotii (Vatican.va)