Leviticus 16:15

11 When Aaron presents the bull for his sin offering and makes atonement for himself and his household, he is to slaughter the bull for his own sin offering.

12 Then he must take a censer full of burning coals from the altar before the LORD, and two handfuls of finely ground fragrant incense, and take them inside the veil.

13 He is to put the incense on the fire before the LORD, and the cloud of incense will cover the mercy seat above the Testimony, so that he will not die.

14 And he is to take some of the bull’s blood and sprinkle it with his finger on the east side of the mercy seat; then he shall sprinkle some of it with his finger seven times before the mercy seat.

15 Aaron shall then slaughter the goat for the sin offering for the people and bring its blood behind the veil, and with its blood he must do as he did with the bull’s blood: He is to sprinkle it against the mercy seat and in front of it.

16 So he shall make atonement for the Most Holy Place because of the impurities and rebellious acts of the Israelites in regard to all their sins. He is to do the same for the Tent of Meeting which abides among them, because it is surrounded by their impurities.

17 No one may be in the Tent of Meeting from the time Aaron goes in to make atonement in the Most Holy Place until he leaves, after he has made atonement for himself, his household, and the whole assembly of Israel.

18 Then he shall go out to the altar that is before the LORD and make atonement for it. He is to take some of the bull’s blood and some of the goat’s blood and put it on all the horns of the altar.

19 He is to sprinkle some of the blood on it with his finger seven times to cleanse it and consecrate it from the uncleanness of the Israelites.

Read all of Leviticus 16