Midrash su Levitico 22:30

1) (Vayikra 22:29) ("And when you sacrifice a sacrifice of thanksgiving to the L–rd, with your acceptance shall you sacrifice it. (Vayikra 22:30) On that day it shall be eaten.") Let this ("On that day, etc.") not be stated (i.e., it is already written in 7:15). If it is not to be understood as referring to eating per se, understand it as referring to slaughtering, i.e., the very beginning of the slaughtering should be with the intention of eating it on the day.

3) I would then include tevel, which is subject to the death penalty; but I would not include neveilah (carcass), which is not subject to the death penalty; it is, therefore, written (in several places) "you shall afflict your souls" to include (all these). I would include neveilah, which is subject to a negative commandment, but I would not include chullin (mundane food), which is not subject to a negative commandment; it is, therefore, written (in several places) "you shall afflict your souls" (to include (all these). I would include chullin, which is not subject to a positive commandment, but I would not include terumah and second-tithe, which are (in some instances) subject to a positive commandment (e.g., in respect to Cohanim). It is, therefore, written "you shall afflict your souls," for inclusion. I would include terumah and second-tithe, which are not subject to "And you shall not leave over" (Vayikra 22:30); but I would not include consecrated food, which is subject to it; it is, therefore, written "you shall afflict your souls," for inclusion. Variantly: "You shall afflict your souls" — affliction which affects (the preservation of) your souls. Which is that? (Abstention from) eating and drinking.

3) From (Vayikra 22:29): "And when you slaughter a sacrifice of thanksgiving to the L–rd, that it be acceptable for you shall you slaughter it. (Vayikra 22:30) On that day shall it be eaten." This need not be stated, (for we know it already). If it is not needed for (the halachah of) eating, learn it as applying to sacrifice, that its sacrifice at the outset must be with the thought of eating it for one day.