Leviticus 8:22-30

And he brought the other ram, the ram of consecration: and Aaron and his sons laid their hands upon the head of the ram.

Brought the other ram ... 'We learn from the Egyptian sculptures that the victim, having its feet tied together, was thrown on the ground; and the priest having placed his hand on its head (as in Leviticus 1:4; Leviticus 3:8), or holding it by the horn, cut its throat, apparently from ear to ear, as is the custom of the Moslems at the present day. The skin was then removed, and after the head had been taken away, the foreleg or shoulder, generally the right shoulder (as in Leviticus 8:26), was the first joint cut off. This was considered and called the choicest part, and was the first offered on the altar (cf. Leviticus 8:25; 1 Samuel 9:24). The other parts were afterward cut up; and the shoulder, the thigh, the head, the rump, the heart, and the kidneys were the principal ones placed on the altar. The body was filled with cakes and various things, after which it was burnt (as in Leviticus 8:25)' (Wilkinson, in Rawlinson's 'Herodotus,' 2:, 69-72).

After the sin offering and burnt offering had been presented on their behalf, this was their peace offering-a federal rite, by which they declared the pleasure which they felt in entering upon the service of the God of Israel, and being brought into close communion with Him as the ministers of His sanctuary, together with their confident reliance on His grace to help them in all their sacred duties (see the notes at Exodus 29:19). Since Aaron was consecrated to the office of high priest by the blood of the ram of consecration [Septuagint, krios teleiooseoos, the ram of perfection], so the apostle (Hebrews 5:8) uses the same word х teleioosai (G5048)] to express the consecration of Christ to His spiritual office; and hence, He is said to have been consecrated (Hebrews 7:28).