Following the intricate instructions for constructing the Tabernacle and tailoring the priestly garments, the focus shifts to the consecration of Aaron and his sons. This seven-day initiation is far more than a technical procedure; it is a profound spiritual elevation. It directly echoes the seven days of creation, intended to restore the world to a state of perfection lost after the primal sin of the serpent [רקנאטי]. Before any physical rituals begin, Moses is instructed to draw Aaron and his sons close through speech and comforting words [קיצור בעל הטורים]. This initial reliance on speech also serves as a subtle vision of the future, hinting at a time when physical sacrifices will cease and words of prayer will entirely replace the service of the altar [רבנו בחיי, צאינה וראינה].
Throughout this week of initiation, Moses takes on an intensely active role, temporarily serving as the High Priest himself to practically demonstrate the order of service [אור החיים, אברבנאל]. This hands-on training directly follows the donning of the priestly garments, which inherently possess the power to atone for the sins of the people [תורה תמימה]. The ultimate goal of this process is to instill the holiness required for the priesthood. This sanctity is achieved through a combination of four essential elements: the offering of sacrifices, washing with water, anointing with oil, and wearing the sacred garments [צרור המור]. The sacrifices, whose funding is debated among commentators as coming either from public donations, Moses' own assets, or Aaron's private wealth [אור החיים, חזקוני, אברבנאל], are not merely symbolic. They function as spiritual tools designed to cleanse the priests of any separating sins and to grant them heavenly assistance, ensuring they can perform their future duties swiftly and without error [העמק דבר].
The required offerings consist of a young bull in its second or third year, and two mature rams over thirteen months old [אבן עזרא, רלב״ג, הירש, שטיינזלץ]. All three animals must be completely whole and free of any physical blemish [אבן עזרא הקצר, שטיינזלץ]. The primary approach among commentators is that the bull is brought specifically to atone for the sin of the Golden Calf [רש״י, גור אריה], serving as a targeted remedy for that precise failure [משכיל לדוד]. This raises a profound theological question: how can a bovine creature, which evokes the memory of the Golden Calf, be used as the instrument of atonement? A well-known principle dictates that a prosecutor cannot serve as a defense attorney; an object that recalls a sin cannot be used to seek favor. Commentators resolve this tension in two ways. First, this restriction only applies to the inner service within the Holy of Holies, whereas this bull is offered in the outer courtyard. Second, when an offering is brought for the express purpose of atoning for that specific sin, it does not act as a prosecutor but is instead fulfilling its original, desired function [מזרחי, גור אריה, דברי דוד].
Together, the three animals represent a gradual, structured process of drawing close to God. The bull acts as a sin offering to cleanse the priests of all spiritual blemish. Following this, the first ram is brought as a burnt offering, consumed entirely by the fire as a gift of total devotion and elevation. Finally, the second ram serves as a peace offering, generating a sense of harmony, closeness, and joy as it is shared among the altar, the priests, and the owners [בכור שור, הירש].
Beyond their functional roles, the specific grouping of one bull and two rams carries deep symbolic resonance. Some view this trio as representing the three Patriarchs: the bull corresponds to Abraham, who famously ran to his herd to host his guests, while the two rams represent Isaac and Jacob [רבנו בחיי, רא״ש, דעת זקנים]. Others draw a parallel to the dawn of humanity, equating the bull with Adam and the rams with Cain and Abel [צרור המור]. Another perspective suggests the bull symbolizes Aaron, while the two rams represent his younger sons, Eleazar and Ithamar. This carries a tragic foreshadowing that his two older sons, Nadab and Abihu, will soon perish and not continue the priestly line [רבנו בחיי, אברבנאל]. From a philosophical standpoint, the large, thick bull represents the material human body, while the two rams embody the dual facets of the human intellect: the theoretical and the practical [אברבנאל].