Exodus 30:7

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, etc. The perfume that was to be burnt on this altar is described Exodus 30:34. No blood was ever sprinkled on this altar, except on the day of general expiation, which happened only once in the year, Exodus 30:10. But the perfume was necessary in every part of the tabernacle and its environs.

The lamps - See Exodus 25:37.

Exodus 30:7-8

The offering of the incense accompanied that of the morning and evening sacrifice. The two forms of offering symbolized the spirit of man reaching after communion with Yahweh, both in act and utterance. See Psalm 141:2.

30:7 Aaron was to burn sweet incense upon this altar every morning and every evening, which was intended not only to take away the ill smell of the flesh that was burnt daily on the brazen altar, but for the honour of God, and to shew the, acceptableness of his people's services to him.As by the offerings on the brazen altar satisfaction was made for what had been done displeasing to God, so by the offering on this what they did well was, as it were, recommended to the divine acceptance.