Shall put their hands upon the head of the bullock - By this rite the animal was consecrated to God, and was then proper to be offered in sacrifice. Imposition of hands also signified that they offered the life of this animal as an atonement for their sins, and to redeem their lives from that death which, through their sinfulness, they had deserved. In the case of the sin-offering and trespass-offering, the person who brought the sacrifice placed his hands on the head of the animal between the horns, and confessed his sin over the sin-offering, and his trespass over the trespass-offering, saying, "I have sinned, I have done iniquity; I have trespassed, and have done thus and thus; and do return by repentance before thee, and with this I make atonement." Then the animal was considered as vicariously bearing the sins of the person who brought it - Exodus 29:14

And thou shalt cause a bullock to be brought before the tabernacle of the congregation,.... The same, or of the same kind he was ordered to take, Exodus 29:1, and here the place is expressed where it was to be taken, and what was to be done with it:

and Aaron and his sons shall put their hands upon the head of the bullock; not Aaron first alone, and then his sons, as some have thought, Aben Ezra makes mention of; but, as he says, both together, not one before another; declaring it to be their sacrifice, a vicarious one, one in their room and stead, signifying that they deserved to die as that creature would; and by this act putting, as it were, their sins and transgressions upon it, see Leviticus 16:21 and which was an emblem of the imputation of sin to Christ, and laying upon him the iniquities of us all.

And thou shalt cause a bullock to be brought before the tabernacle of the congregation: and Aaron and his sons shall {c} put their hands upon the head of the bullock.

(c) Signifying that the sacrifice was also offered for them, and that they approved it.

29:10 There must be a sin - offering, to make atonement for them. The law made them priests that had infirmity; and therefore they must first offer for their own sin, before they could make atonement for the people, Heb 7:27,28. They were to put their hand on the head of their sacrifice; confessing that they deserved to die for their own sin, and desiring that the killing of the beast might be accepted as a vicarious satisfaction. It was used as other sin - offerings were; only, whereas the flesh of other sin - offerings was eaten by the priests, in token of the priests taking away the sin of the people, this was appointed to be all burnt without the camp, to signify the imperfection of the legal dispensation, for the sins of the priests themselves could not be taken away by those sacrifices, but they must expect a better high priest, and a better sacrifice.

Margin put their hands

See Scofield Note: "Lev 1:4"

10-22. And thou shalt cause a bullock to be brought before the tabernacle-This part of the ceremonial consisted of three sacrifices: (1) The sacrifice of a bullock, as a sin offering; and in rendering it, the priest was directed to put his hand upon the head of his sacrifice, expressing by that act a consciousness of personal guilt, and a wish that it might be accepted as a vicarious satisfaction. (2) The sacrifice of a ram as a burnt offering (Ex 29:15-18). The ram was to be wholly burnt, in token of the priest's dedication of himself to God and His service. The sin offering was first to be presented, and then the burnt offering; for until guilt be removed, no acceptable service can be performed. (3) There was to be a peace offering, called "the ram of consecration" (Ex 29:19-22). And there was a marked peculiarity in the manner in which this other ram was to be disposed of. The former was for the glory of God-this was for the comfort of the priest himself; and as a sign of a mutual covenant being ratified, the blood of the sacrifice was divided-part sprinkled on the altar round about, and part upon the persons and garments of the priests. Nay, the blood was, by a singular act, directed to be put upon the extremities of the body, thereby signifying that the benefits of the atonement would be applied to the whole nature of man. Moreover, the flesh of this sacrifice was to be divided, as it were, between God and the priest-part of it to be put into his hand to be waved up and down, in token of its being offered to God, and then it was to be burnt upon the altar; the other part was to be eaten by the priests at the door of the tabernacle-that feast being a symbol of communion or fellowship with God. These ceremonies, performed in the order described, showed the qualifications necessary for the priests. (See Heb 7:26, 27; 10:14).

29:1-37 Aaron and his sons were to be set apart for the priest's office, with ceremony and solemnity. Our Lord Jesus is the great High Priest of our profession, called of God to be so; anointed with the Spirit, whence he is called Messiah, the Christ; clothed with glory and beauty; sanctified by his own blood; made perfect, or consecrated through sufferings, Heb 2:10. All believers are spiritual priests, to offer spiritual sacrifices,