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.

6. thou shalt put it before the veil that is by the ark of the testimony—which separated the holy from the most holy place. The altar was in the middle between the table of showbread and the candlestick next the holy of holies, at equal distances from the north and south walls; in other words, it occupied a spot on the outside of the great partition veil, but directly in front of the mercy seat, which was within that sacred enclosure; so that although the priest who ministered at this altar could not behold the mercy seat, he was to look towards it, and present his incense in that direction. This was a special arrangement, and it was designed to teach the important lesson that, though we cannot with the eye of sense, see the throne of grace, we must "direct our prayer to it and look up" [Ps 5:3] (compare 2Co 3:14; Heb 10:20; Re 4:1).