Leviticus 16:11-13

11And Aaron shall bring the bull of the sin offering, which is for himself, and shall make an atonement for himself, and for his house, and shall kill the bull of the sin offering which is for himself: 12And he shall take a censer full of burning coals of fire from off the altar before the LORD, and his hands full of sweet incense beaten small, and bring it within the veil: 13And he shall put the incense upon the fire before the LORD, that the cloud of the incense may cover the mercy seat that is upon the testimony, that he may not die: