10 And once every year Aaron is to make its horns clean: with the blood of the sin-offering he is to make it clean once every year from generation to generation: it is most holy to the Lord.

Matthew Henry's Commentary on Exodus 30:10

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.