The consecration of Aaron's priesthood involved:
These patterns were later used for the people's regular offerings (see 29:38–46; Leviticus 1–5). In each case, Aaron and his sons placed their hands on the heads of the sacrificial animals (Exodus 29:10, 15, 19). This act showed that sin is a matter of life and death. God will only remove sin by a death.
Because it represents life, blood was important in these ceremonies (29:12, 16, 20, 21).