Rashi on Leviticus 22:30/רש"י על ויקרא כ״ב:ל׳

1ביום ההוא יאכל IT SHALL BE EATEN ON THE SAME DAY — Scripture only intends by these words to express the warning that the slaughtering shall be done with this in mind (Sifra, Emor, Chapter 9 2), for if it intended to fix the time for eating it they would be redundant, since it is already stated (Leviticus 7:15) “And the flesh of the sacrifice of his feast offerings for acknowledgment [shall be eaten the same day that it is offered]”.

2אני ה׳ I AM THE LORD — Know Who it is that has decreed this matter, and let it, therefore, not be a light thing in your eyes!