Midrash su Levitico 14:19

13) (Vayikra 14:19) ("And the Cohein shall offer up the sin-offering, and he shall atone for the one to be cleansed from his uncleanliness, and after he shall slaughter the burnt-offering.") "And the Cohein shall offer up the sin-offering.": All of its attendant activities must be with express intention for a sin-offering. "And the Cohein shall offer up the sin-offering and he shall atone.": What is the intent of this? (i.e., The next verse concludes "and the Cohein shall make atonement for him and he shall be clean.") Because it is written (Vayikra 14:20) "And the Cohein shall offer up the burnt-offering and the meal-offering upon the altar," I might think that they are all indispensable (for his eating consecrated food). It is, therefore, written "And the Cohein shall offer up the sin-offering and he shall atone," whereby we are taught that his atonement is effected by the sin-offering. "and he shall atone for the one to be cleansed from his uncleanliness.": From his (leprosy) uncleanliness, and not from his (leprosy) uncleanliness and his zav (genital discharge) uncleanliness. "and after he shall slaughter the burnt-offering.": after this act (of sprinkling the blood of the sin-offering).

"You shall not wear": This tells me only of wearing. Whence do I derive that he may not cover himself with it! From (Vayikra 14:19) "and a garment kilayim shatnez shall not come upon you." I might think that he may not throw a bundle (containing shatnez) over his shoulder (to carry it); it is, therefore, written "You shall not wear." Wearing was included in the general interdict (against shatnez). Why was it singled out (for special mention)? To use it as the basis for a comparison, viz.: Just as "wearing" is distinctive in that it is of benefit to the body, so, all that is distinctive (is forbidden by reason of shatnez, to exclude throwing it over one's shoulder).