Leviticus 6:23

23. Wholly burnt… not be eaten Since it was a thank offering to Jehovah it would be improper for the priest to eat it. To appropriate it to himself after presenting it to the Lord would destroy the vital element of sacrifice, self-denial. This law applies to all offerings of the priest, especially to his sin offering, the eating of which would imply that he could atone for his own sins, and that he had no need of a substitute prefiguring “the Lamb of God, which taketh away the sin of the world.” The sin offering for a private individual or for a prince was to be eaten by the priesthood. That for the whole nation, since the priests were included, could not be eaten.