Clarke's Bible Commentary - Exodus 30:7
Verse 7. When he dresseth the lamps] Prepares the wicks, and puts in fresh oil for the evening. Shall burn incense upon it.] Where so many sacrifices were offered it was essentially necessary to have some pleasing perfume to counteract the disagreeable smells that must have arisen from the slaughter of so many animals, the sprinkling of so much blood, and the burning of so much flesh, &c. The perfume that was to be burnt on this altar is described ver. 34. No blood was ever sprinkled on this altar, except on the day of general expiation, which happened only once in the year, Exodus xxx. 10.
But the perfume was necessary in every part of the tabernacle and its environs.
Matthew Henry Commentary
Verses 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 dail 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.
Original Hebrew
והקטיר 6999 עליו 5921 אהרן 175 קטרת 7004 סמים 5561 בבקר 1242 בבקר 1242 בהיטיבו 3190 את 853 הנרת 5216 יקטירנה׃ 6999