Commento su Levitico 10:5

בכתנתם IN THEIR GARMENTS — in those of the dead (not in their own garments). This tells us that their garments had not been destroyed by fire, but their souls alone (neither their clothing nor bodies showed signs of burning; they had been struck by fire inwardly): there entered into their nostrils something like two threads of fire which burnt them to death (Sifra, Shemini, Mechilta d'Miluim 2 34; Sanhedrin 52a).

בכתנותם אל מחוץ למחנה, they did not bother to remove their holy vestments from them seeing that these had already become ritually impure.

Of the dead men. As it is written, “בכתנתם (in their tunics),” and every כתונת mentioned in Torah Kohanim (Vayikro) is referring to garments of kehunah. Mishael and Elzafan, however, were Levites and not kohanim; so from where would they have tunics? Rather, it must refer to [the tunics of] the dead men.

בכתנותם, “in their tunics;” not the tunics of the pallbearers. Only priests, not Levites, wore those tunics.