Tafsiran Imamat 23:37: Rashi, Siftei Chakhamim, Or HaChaim & Rav Hirsch

עלה ומנחה A BURNT OFFERING AND A MEAL OFFERING — This means the מנחת נסכים (the meal-offering due with the drink-offering) that is brought together with the‎ עולה (Menachot 44b)‎.

With the burnt-offering. Rashi is answering the question: Many [kinds] of meal offerings are written in parshas Vayikra, so why does the verse not specify which one it is? Re’m explains that if the meal-offering was by itself, it should have said “a burnt-offering and a sacrifice and wine-offerings and a meal-offering.”

מועדי השם, "the appointed seasons of the Lord, etc." Torat Kohanim on verse 35 quotes Rabbi Akiva as saying that these are the days on which the performance of work is prohibited. I believe this may also be the reason why the Torah concludes by writing: ומלבד מתנותיכם, "and beside your gifts, etc., which you will present to the Lord." These "gifts" include burnt-offerings. We know from Beytzah 19 that burnt-offerings may not be offered on festivals. The Talmud derives this from the word לכם, "for you," and "not for G'd." When we take this into consideration it is clear that verse 38 speaks of the intermediate days of the festivals of Passover and Sukkot.

‎‎ביומו‎ ‎יום‎ ‎דבר EVERYTHING UPON ITS DAY (lit., the thing of the day, on its day) — the quantity definitely assigned to each day in the Book of Numbers (cf. Rashi on Exodus 16:4).

דבר יום ביומו EVERYTHING UPON ITS DAY (which may mean the matter of the day shall be on its day) — consequently if its day (the day on which some particular one of these sacrifices is due) be past, it's (the day’s) offering is past (cf. Sifra, Emor, Section 12 9).