Exodus 30:7-10

7“Aaron must burn fragrant incense on the altar every morning when he tends the lamps. 8He must burn incense again when he lights the lamps at twilight so incense will burn regularly before the Lord for the generations to come. 9Do not offer on this altar any other incense or any burnt offering or grain offering, and do not pour a drink offering on it. 10Once a year Aaron shall make atonement on its horns. This annual atonement must be made with the blood of the atoning sin offering for the generations to come. It is most holy to the Lord.”