Halakhah sur Les Nombres 29:18

The commandment of the additional sacrifice on each day of the seven days of Sukkot: To sacrifice a sacrifice on the holiday of Sukkot, as it is stated (Leviticus 23:36), "Seven days shall you sacrifice a fire-offering" - and this is the additional [sacrifice] of the holiday. And in the Order of Pinchas (Numbers 29:13-35), it writes at greater length and explains about the additional sacrifice of each and every day - how many beasts they would sacrifice - as each day was different than its fellow, since the bulls would diminish on each day. And they, may their memory be blessed, said (see Rashi on Numbers 29:18) that in the merit of this commandment will the enemies of Israel diminish, just as the bulls diminish each day. And I have already written - from the angle of the simple understanding - about the additional sacrifice of Pesach, a root sufficient for all of the additional [sacrifices], according to my opinion. And Rambam, may his memory be blessed, brought the verse that is in the Order of Pinchas in his tally (Sefer HaMitzvot LaRambam, Mitzvot Ase 50), whereas I have brought the one that is first in the Torah. But it all comes to the same [thing].