Leviticus 16:14

He shall take a censer full of coals of fire from off the altar before Yahweh, and two handfuls of sweet incense beaten small, and bring it within the veil:

and he shall put the incense on the fire before Yahweh, that the cloud of the incense may cover the mercy seat that is on the testimony, so that he will not die.

Then he shall kill the goat of the sin offering, that is for the people, and bring his blood within the veil, and do with his blood as he did with the blood of the bull, and sprinkle it on the mercy seat, and before the mercy seat:

and he shall make atonement for the Holy Place, because of the uncleanness of the children of Israel, and because of their transgressions, even all their sins; and so he shall do for the Tent of Meeting, that dwells with them in the midst of their uncleanness.