The Lord said to Moses,
“This is how Aaron is to enter the Most Holy Place: He must first bring a young bull for a sin offering and a ram for a burnt offering.
“ ‘This is a lasting ordinance for the generations to come, wherever you live: You must not eat any fat or any blood.’ ”
“ ‘If the whole Israelite community sins unintentionally and does what is forbidden in any of the Lord’s commands, even though the community is unaware of the matter, when they realize their guilt
“Say to the Israelites: ‘When anyone sins unintentionally and does what is forbidden in any of the Lord’s commands—
But any sin offering whose blood is brought into the tent of meeting to make atonement in the Holy Place must not be eaten; it must be burned up.
So Aaron came to the altar and slaughtered the calf as a sin offering for himself.