Ramban (Nachmanides) on the Torah

He mentioned [with reference to the Additional Offerings of] the first day of the seventh month [i.e., the New Year], beside the burnt-offering of the New Moon and the meal-offering thereof, but He did not mention the sin-offering of the New Moon, while [with reference to] the Day of Atonement He did mention beside the sin-offering of atonement, but did not mention the burnt-offering of atonement. The reason for this is that concerning the Day of Atonement, it is obvious that the burnt-offering [which He commanded here to be brought on that day] is beside the burnt-offering which He commanded there, for both of them are commanded with reference to the same day, and they are not equal; for there [in the Book of Leviticus] the Israelites were only commanded [to bring on the Day of Atonement] one ram for a burnt-offering, and here He commanded as a burnt-offering [that they bring] a bullock, a ram, and seven he-lambs. If so, it is quite clear that these [offerings mentioned here] are in addition to those mentioned there. But [in the case of] the sin-offering, which is the same [both] here and there, one might possibly have made a mistake in connection with it, and think that [the one commanded here] is the same sin-offering which is mentioned there, since [we do not find] two sin-offerings [brought] on one day. Therefore when mentioning it [here] He expressly stated: [one he-goat for a sin-offering] ‘beside the sin-offering of atonement,’ for that sin-offering [mentioned in the Book of Leviticus] is the sin-offering of atonement, that is to say, it is the inner sin-offering that is burnt [outside the camp, or outside the city of Jerusalem], and atones for the holy place, because of the uncleanness of the children of Israel, and because of their transgressions, even all their sins; whereas this outer sin-offering is like other sin-offerings, which come together with the Additional Offerings. Similarly [when speaking about] the day of the first-fruits [the Festival of Weeks], it was not necessary to say that what is commanded here is “beside what has been said about it in the section of the festivals,” since the two sections are said about the same day, and the offerings are not the same [and therefore it is self-understood that the offerings mentioned here are in addition to those mentioned there]. Nor was it necessary to state [here when speaking about the offerings of the Festival of Weeks, i.e., Shavuoth, that they are beside] the sin-offering [mentioned in the section of the festivals],, Verse 19. because Scripture said there explicitly, And ye shall present with the bread [seven lambs etc. And ye shall offer one he-goat for a sin-offering etc.],, Verses 18-19. and it is quite clear [therefore] that all [the offerings] mentioned there come because of the [two] loaves and must he brought with them, and that these mentioned here are in addition to them. But in the case of the New Moon of this seventh month, one might have thought that when Scripture says, And in your New Moons ye shall present etc. it applies to all the other months [of the year], but that [on the New Moon of] the seventh month the total offering is to be only this [group of] offerings which He especially commanded for it; therefore it was necessary to say, beside the burnt-offering of the New Moon, and the meal-offering thereof. And having mentioned this, we can already deduce that everything that is mentioned in the section of And in your New Moons is an obligation for all months, including the sin-offering [of the New Moon], and therefore it was not necessary to say [here in the case of the New Year]: “beside the burnt-offering of the New Moon, and the meal-offering thereof ‘and the sin-offering thereof.’”