Matthew Henry on Numbers 8:1-4

Aaron himself lighted the lamps, thus representing his Divine Master. The Scripture is a light shining in a dark place, 2Pe 1:19. A dark place even the church would be without it; as the tabernacle, which had no window, would have been without the lamps. The work of ministers is to light these lamps, by expounding and applying the word of God. Jesus Christ is the only Light of our dark, sinful world; and by his atonement, by his word and the Holy Spirit, he diffuses light around.