Although the worshippers and the priests were allowed to eat part of certain offerings made under the law, there were also other offerings which they were not allowed to eat. The burnt offerings of Leviticus 1 were to be burnt on the altar in their entirety, their blood being sprinkled on the altar.
The reason for this command to burn the sacrifice outside the camp may have been obscure to Old Testament worshippers. They may have understood something about the shame associated with sin which demanded that the sin offering to be removed from the camp and burned outside to take away the shame from the presence of God’s people, but they would not have understood how literally this was to be fulfilled in the circumstances of Christ’s death – not until Calvary had taken place.