Leviticus 16:11-16

“Then Aaron shall offer the bull of the sin offering which is for himself and make atonement for himself and for his household, and he shall slaughter the bull of the sin offering which is for himself. He shall take a firepan full of coals of fire from upon the altar before the LORD and two handfuls of finely ground sweet incense, and bring it inside the veil. He shall put the incense on the fire before the LORD, that the cloud of incense may cover the mercy seat that is on the ark of the testimony, otherwise he will die. Moreover, he shall take some of the blood of the bull and sprinkle it with his finger on the mercy seat on the east side; also in front of the mercy seat he shall sprinkle some of the blood with his finger seven times. “Then he shall slaughter the goat of the sin offering which is for the people, and bring its blood inside the veil and do with its blood as he did with the blood of the bull, and sprinkle it on the mercy seat and in front of the mercy seat. He shall make atonement for the holy place, because of the impurities of the sons of Israel and because of their transgressions in regard to all their sins; and thus he shall do for the tent of meeting which abides with them in the midst of their impurities.