Komentaryo sa Levitico 23:31: Rashi, Sforno, Siftei Chakhamim & Rav Hirsch

'‎‎כל מלאכה וגו‎ [YE SHALL NOT DO] ANY WORK — This is repeated (cf v. 30) in order to make one who does work on Yom Kippur transgress several negative commands. Or, it is repeated, in order to prohibit working in the night of Yom Kippur, just as well as working during the day itself (Yoma 81a).

בכל מושבותיכם, even though nowadays there is no way of obtaining atonement by means of the altar which is part of commandments applicable to this day.

Work at night is prohibited, just as working during the day [is prohibited]. You might ask: Why is this necessary? Why would one exclude the night? The answer is: One may have thought, since it is written “on this very day,” it implies only the actual day as in the verses (Bereishis 7:13) “On that very day Noach came,” “On that very day Avraham [and his son Yishmael] were circumcised” (ibid 17:26). These, which means specifically during the actual daytime, so “Any person who does any work on this very day, etc.,” means specifically during the actual daytime. Therefore one needs “any work, etc.” (Re’m) Alternatively, the Gemara (Yuma 81a) says that “on this very day” excludes time added to Yom Kippur., Ii.e., someone who does work during the time added from weekday to sacred at the beginning and the end [of Yom Kippur], one is not liable for koreis. Thus, one may have thought that night too is excluded from [the prohibition of doing] work, and one needs an inclusory verse is necessary.