פּירוש אויף ויקרא 4:12

אל מקום טהור [EVEN THE WHOLE BULLOCK SHALL HE BRING FORTH WITHOUT THE CAMP] UNTO A CLEAN PLACE — Because there was outside the city (Jerusalem) a place intended for depositing unclean things viz., to cast there the plague-stricken stones (cf. Leviticus 14:45) and to serve as a place of burial, Scripture was compelled to state regarding this term “without the camp” — which in the case of Jerusalem, is identical with: “without the city” — that the place where it was to be burnt shall be a clean one.

where the ashes are to be poured There must be ashes from the Altar in the place where it is burnt.

אל שפך הדשן, seeing that the Torah writes in Leviticus 6,4,והוציא את הדשן אל מחוץ למחנה “he shall take the ashes outside the encampment,” the Torah here had to tell us where the ash was stored.

מחוץ למחנה WITHOUT THE CAMP — i. e. without the three camps (מחנה שכינה, מחנה לויה ומחנה ישראל) ; and, in the case of the “House of Eternity” (the Temple), it was to be brought forth without the city, just as our Rabbis have explained it in Treatise Yoma 68a and in Treatise Sanhedrin 42b.

אל שפך הדשן means: to the place where the ashes that were removed from the altar were cast, as it is said (Leviticus 6:4) “and he shall bring out the ashes without the camp”.