Мидраш к Бамидбар 5:4

5) (He must bring a sin-offering (Bamidbar 4:2): ["if he sin unwittingly of]) all the mitzvoth of the L–rd": and not the mitzvoth of the king and not the mitzvoth of beth-din. "of all the mitzvoth of the L–rd": and not all of the mitzvoth of the L–rd": to exclude (the bringing of a sin-offering for) "hearing the voice of an oath" (see Bamidbar 5:1), and "pronouncing with the lips" (see Bamidbar 5:4), and defilement of the sanctuary and its sacred things (see Bamidbar 5:2) (for all of which he brings a sliding-scale offering [oleh veyored]).

3b) binyan av mishnei kethuvim (a general rule derived from two verses). viz.: The topic of the lamps (on the menorah) is not like that of sending the unclean outside (of the encampment), and the latter is not like the former. What is common to them is that they are introduced by "Tzav" ("Command") — [the lamps, (Vayikra 24:2); sending, etc., (Bamidbar 5:2)] — and apply both immediately and for future generations. [The lamps: immediately — (Bamidbar 8:3): "And Aaron did so. He kindled its lamps towards the face of the menorah, etc."; for future generations — (Vayikra 24:3): "… an eternal statute throughout your generations." Sending the unclean outside: immediately — (Bamidbar 5:4): "And the children of Israel did so, and they sent them outside the camp"; for future generations — (Bamidbar 19:21): "And it shall be for them an everlasting statute."] So, all commandments introduced by "Tzav" apply both immediately and for future generations.

7) kllal shehu tzarich lifrat ufrat shehu tzarich lichllal (general requiring specific and specific requiring general): (Shemoth 13:2): "Sanctify unto Me every bechor (first-born), the opener of each womb." I might think that even females are included; it is, therefore, written (Devarim 15:19): "the male." If "the male," (I would think that) even a yotze dofen (Caesarian birth) were a bechor. It is, therefore, written "the opener of the womb." This is an instance of "general" (bechor) requiring "specific." I might think that even if it were born after a yotze dofen it were a bechor (being the first opener of the womb); it is, therefore, written "bechor," (which connotes first in all respects; not only first opener of the womb, but also first in birth). This is an instance of "specific" ("opener of the womb") requiring "general" (bechor).

43) "for the anointing oil of the L–rd is upon you": What is the intent of this? I might think that only Aaron and his sons who were exalted with the oil of anointment, if they went out while officiating, would be liable to death — it is, therefore, written "for the anointing oil of the L–rd is upon you" (upon all high-priests, even if not anointed). "and they did according to the word of Moses": They fulfilled in themselves the mitzvah of Moses their teacher. And thus does Scripture praise Israel in the section of the sending (out of the camp) those who had become tamei, viz. (Bamidbar 5:4): "And the children of Israel did so, and they sent them outside the camp." And thus does Scripture praise Joshua, viz. (Joshua 11:15): "As the L–rd had commanded Moses, so had Moses commanded Joshua, and so did Joshua do."