Midrash su Levitico 6:19

1) R. Elazar b. R. Shimon says: A (Cohein) tvul yom (one who immersed in the daytime, and becomes clean at sunset) came and said to (another) Cohein: Give me of the meal-offering (of an Israelite) to eat it (tonight). The Cohein: Now if in a place (i.e., an instance) where you are "strong," in your sin-offering, (i.e., a Cohein who is liable for a sin-offering may bring it at any priestly watch and take its priestly portions), I have pushed you away from the sin-offering of an Israelite (A tvul yom does not share in it, viz. Vayikra 6:19), then in a place where you are "weak," in your meal-offering, (Even a clean Cohein may not eat his own meal-offering, it being entirely burnt), does it not follow that I should push you away from the meal-offering of an Israelite today (when you are a tvul yom and unfit to sacrifice the meal-offering of an Israelite)! The tvul yom: Why would you push me away from the sin-offering of an Israelite? Because you are "strong" in your own sin-offering. Would you then push me away from the meal-offering of an Israelite, when you are "weak" in your own meal-offering? The Cohein (Vayikra 7:9): "To the Cohein that sacrifices (a meal-offering), to him shall it be" — Come, sacrifice (when you are clean) and eat!

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.

2) The tvul yom: If not (i.e., if you do not give me of the meal-offering), give me to eat of the sin-offering. The Cohein: Now, if in a place where I am "weak," in my meal-offering, I have pushed you away from the meal-offering of an Israelite, then in a place where I am strong, in my sin-offering, does it not follow that I should push you away from the sin-offering of an Israelite! The tvul yom: No, if you have pushed me away from the meal-offering of an Israelite, it is because I am "weak" in my own meal-offering. Would you then push me away from the sin-offering of an Israelite, when I am strong in my own sin-offering? The Cohein (Vayikra 6:19): "The Cohein who offers it as a sin-offering shall eat it." Come, sacrifice a sin-offering (when you are clean), and eat!