Leviticus 4:5

‘But no sin offering, of which any of the blood is brought into the tent of meeting to make atonement in the holy place, shall be eaten; it shall be burned with fire.

So Aaron came near to the altar and slaughtered the calf of the sin offering which was for himself.

“Aaron shall enter the holy place with this: with a bull from the herd for a sin offering and a ram for a burnt offering.

And they brought seven bulls, seven rams, seven lambs, and seven male goats for a sin offering for the kingdom, the sanctuary, and Judah. And he ordered the priests, the sons of Aaron, to offer them on the altar of Yahweh.