Midrash su Levitico 6:20

1) (Vayikra 6:18) ("Speak to Aaron and his sons, saying: This is the law of the sin-offering. In the place where the burnt-offering is slaughtered, there shall the sin-offering be slaughtered, before the L–rd; it is holy of holies.") "This is the law of the sin-offering": This (the sin-offering) does not obtain on a bamah (a temporary altar). "the law of the sin-offering": There is one law for all sin-offerings, that their blood (if it sprinkled onto a garment) requires washing. — Now where is it excluded (from washing that we need a verse to include it)? — Because it is written (Vayikra 6:19): "The Cohein who offers it as a sin-offering shall eat it" and (Vayikra 6:20): "and what shall be sprinkled of its blood upon a garment … shall be washed," I would think that only outer sin-offerings, (which are eaten by the Cohanim) require washing, but not inner sin-offerings, (which are burnt). And (what is more) it would follow a fortiori, viz.: Now if holy of holies (guilt-offerings), which are similar to outer sin-offerings in requiring scouring and rinsing (of the vessels in which they have been cooked), do not require washing (of garments), then inner sin-offerings, which are not similar (to them) in requiring scouring and rinsing, (not being eaten and not being cooked), how much more so should they not require washing. It is, therefore, (to negate this) written "the law of the sin-offering": There is one law for all sin-offerings, that their blood requires washing.

1) (Vayikra 6:20) ("And what shall be sprinkled of its blood upon a garment, that which has been sprinkled on, you shall wash in a holy place.") "what shall be sprinkled of its blood": of the blood of an animal that is fit, and not of that of an animal which is unfit. R. Akiva says: If it had a time of fitness and its blood became unfit, (as when its blood remained overnight or became tamei), washing is required. If it did not have a time of fitness and its blood became unfit, (as when it became unfit in being slaughtered or in the receiving of its blood), washing is not required. R. Shimon says: Even if it had a time of fitness and it became unfit, washing is not required.

2) "of its blood": and not of the blood of holy of holies, (such as the blood of communal peace-offerings or of guilt-offerings. If it were sprinkled on a garment, it does not require washing.) For would it not follow a fortiori (that it does require washing), viz.: If inner sin-offerings, which are not similar to outer sin-offerings in (requiring) scouring and rinsing (of vessels in which they are cooked), are similar to them in (requiring) washing, then holy of holies, which are similar to outer sin-offerings in (requiring) scouring and rinsing, does it not follow that they should be similar to them in (requiring) washing! It is, therefore, (to negate this,) necessary to write "of its blood." "of its blood": and not of its broth (If its broth sprinkled on a garment, it does not require rinsing.) For would it not follow a fortiori (that it does require washing), viz.: If blood, which does not require scouring and rinsing (of vessels), requires washing (of garments), then broth, which does require scouring and rinsing, should it not follow that it requires washing! It is, therefore, (to negate this,) necessary to write "of its blood" and not of its broth.