Rashi on Leviticus 23:8/רש"י על ויקרא כ״ג:ח׳

1'והקרבתם אשה וגו‎‎ BUT YE SHALL OFFER A FIRE-OFFERING etc. — This is identical with the additional offerings due on the first day of Passover which are mentioned in the section of פנחס (Numbers 28:19). But why are these referred to here? In order to intimate that the additional offerings do not impede one another (i. e. that if a particular animal of these מוספים cannot be sacrificed, it is still lawful to bring the others) (Menachot 49a), because it states: —

2‎'והקרבתם אשה לה‎ YE SHALL BRING THE FIRE-OFFERING OF THE LORD — bring it under any circumstances — if there are no bullocks available as prescribed, offer the prescribed rams; and if there are neither bullocks nor rams, offer the lambs (Sifra, Emor, Chapter 11 5).

3שבעת ימים SEVEN DAYS — Wherever the term שבעת is used it is a noun (not a cardinal numeral), so that the words here mean a septaine of days (a period of seven days), in old French Similar is the meaning of all the expressions שמנת ,ששת ,חמשת ,שלשת.

4מלאכת עבדה [YOU SHALL DO NO] SERVILE WORK — Not even such labors as are regarded by you as an obligation and a necessity, the neglect of which involves loss of money, as, for instance, a matter that may become lost (that cannot be postponed without irretrievable loss). I understand this (that the above is the meaning of מלאכת עבדה) from Torat Cohanim (on .v 36 of this chapter), since it states there: I might think from what Scripture states (vv. 36, 37) כָּל מְלֶאכֶת עֲבֹדָה לֹא תַעֲשׂוּ אֵלֶּה מוֹעֲדֵי‎ that‎ מלאכת עבדה is forbidden also on the intermediate days of Passover and Tabernacles (lit., the week-days of the festivals). Scripture, however, states, “it (the eighth day) is a festival and ye shall do no מלאכת עבדה” thus intimating that on a day which is not a festival such work is permitted. The intermediate days are not regarded as a festival and the rule is that דבר האבד may be attended to. Hence the very question: “may מלאכת עבדה be done on the intermediate days?”, implies that the term denotes דבר האבד.