 The priests were to officiate at many offerings under the Law of Moses, including the passover sacrifice, sin offering, guilt offering, release of the scapegoat, burnt offering, peace offering, heave offering, meal offering, dough offering, drink offering, incense offering, thank offering, etc., throughout the liturgical year.As well, they would engage in many different rituals, such as the priestly blessing, the red heifer, the redemption of the firstborn, and various purification rituals.The garments of the priests and high priests are described, and proscribed, in detail in Leviticus.