In John 6: 53-54 Jesus causes controversy and confusion by explaining that redemption comes through feeding on him: “So Jesus said to them, ‘Truly, truly, I say to you, unless you eat the flesh of the Son of Man and drink his blood, you have no life in you.54 Whoever feeds on my flesh and drinks my blood has eternal life, and I will raise him up on the last day. 55 For my flesh is true food, and my blood is true drink.'”
Perhaps this shouldn’t be surprising in light of Exodus 29. There we read that Aaron and his sons are “baptized” into the priesthood. When they offer sacrifices, they will be eaten: 31 “You shall take the ram of ordination and boil its flesh in a holy place. 32 And Aaron and his sons shall eat the flesh of the ram and the bread that is in the basket in the entrance of the tent of meeting. 33 They shall eat those things with which atonement was made at their ordination and consecration, but an outsider shall not eat of them, because they are holy.
The priests must eat of the flesh which ordained and consecrated them for their calling, so must the royal priesthood which the victorious Lamb redeems.