Leviticus 16:12-13

12he will fill an incense burner with burning coals from the altar that stands before the Lord. Then he will take two handfuls of fragrant powdered incense and will carry the burner and the incense behind the inner curtain.

13There in the Lord’s presence he will put the incense on the burning coals so that a cloud of incense will rise over the Ark’s cover—the place of atonement—that rests on the Ark of the Covenant. If he follows these instructions, he will not die.