Exodus 30:6-10

“Place the Altar in front of the curtain that hides the Chest of The Testimony, in front of the Atonement-Cover that is over The Testimony where I will meet you. Aaron will burn fragrant incense on it every morning when he polishes the lamps, and again in the evening as he prepares the lamps for lighting, so that there will always be incense burning before GOD, generation after generation. But don’t burn on this Altar any unholy incense or Whole-Burnt-Offering or Grain-Offering. And don’t pour out Drink-Offerings on it. Once a year Aaron is to purify the Altar horns. Using the blood of the Absolution-Offering of atonement, he is to make this atonement every year down through the generations. It is most holy to GOD.”