Вайикра 1:7 Комментарий: Rashi, Ibn Ezra, Rabbeinu Bahya & Chizkuni

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).

The sons of Aaron for the Levites may not approach the Altar. This commandment falls upon kohanim — the use of the plural means that no fewer than two must participate.

ונתנו בני אהרן הכהנים אש על המזבח, “the sons of Aaron, the priest are to place fire on the altar.” Our sages in Yuma 53 state that the only sin which brought about the death of the sons of Aaron was the fact that they made a religious/ritual ruling on their own authority when they should have consulted their elders Moses and/or Aaron. What did they read in the Torah which caused them to make this statement? They referred to our verse. The sons of Aaron took this verse as proof that although heavenly fire was expected to descend from heaven to consume the offerings on the altar, it was still a commandment to also contribute man-made fire.

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).