Komentaryo sa Levitico 1:7: Rashi, Kli Yakar, Tur HaArokh & Rabbeinu Bahya

אש … ‎ונתנו AND [THE SONS OF AARON …] SHALL PUT FIRE [ON THE ALTAR] — Although the fire descended from heaven, it was nevertheless a religious duty to bring also some fire of profane origin (Sifra, Vayikra Dibbura d'Nedavah, Chapter 5 10; Yoma 21b; cf. Rashi on Leviticus 10:2 and Note thereon).

“And the sons of Aaron the priests shall put fire.” Even though fire descends from heaven, it is a commandment to bring [fire] from ordinary sources in order to mix the fire from above with the fire from below, and to judge the sinner in two courts of law, in order to atone for thoughts about the type of sin that should be judged in the heavenly court, and for thoughts about the type of sin that should be judged in the earthly court. This is the reason for Sustain me with raisin cakes [ashishot] (Song of Songs 2:5) — two types of fire [esh] — for I am sick with love — these are the sins, the sickness of the soul that affects the love of the Holy One, blessed be He, and He is healed through these two fires.

ונתנו בני אהרן, ”the sons of Aaron are to place the blood, etc.” The reason why the Torah uses the plural mode, -as if one priest by himself could not perform this task- is that it is customary for the Torah when describing the functions performed by the priests in the Tabernacle, to use the plural mode. There used to be numerous priests milling around in the Temple precincts, seeing that there they would be in the proximity of the Shechinah. We have the principle of ברוב עם הדרת מלך, when the king is surrounded by a multitude of his subjects this reflects positively on the degree of his glory.” [Menachot 62 (et al) where a function is distributed amongst 3 priests although a single one could easily have performed it by himself. Ed.]

בני אהרן הכהן THE SONS OF AARON THE PRIEST — They shall place the fire on the altar as sons of Aaron the priest: implying that Aaron should always minister in his priestly dignity (i. e. when attired in his priestly garments), consequently if he officiated in the garments of an ordinary priest his service is invalid (Sifra, Vayikra Dibbura d'Nedavah, Chapter 5 9; Zevachim 18a).