7 Aaron will burn fragrant incense on it every morning when he polishes the lamps, 8 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. 9 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.
Matthew Henry's Commentary on Exodus 30:7-9
Commentary on Exodus 30:1-10
(Read Exodus 30:1-10)
The altar of incense represented the Son of God in his human nature, and the incense burned thereon typified his pleading for his people. The continual intercession of Christ was represented by the daily burning of incense thereon, morning and evening. Once every year the blood of the atonement was to be applied to it, denoting that the intercession of Christ has all its virtue from his sufferings on earth, and that we need no other sacrifice or intercessor but Christ alone.