Commentaire sur Les Nombres 28:11

ובראשי חדשיכם, it was an ancient custom among the Israelites to treat the day of the new moon as a semi festival. We know this already from Samuel I 20,19 where Yonathan describes the day as one on which no work is performed in the field, a day not defined as יום המעשה, “a working day.” This is why this day has retained a special significance for the Jewish people, i.e. the Torah describes it as ראשי חדשיכם “the beginning of your months.” You will not find the regular festivals, מועדים described as “your festivals.” We do not find the Sabbath described as “your Sabbath” or the festival of Shavuot as “your day of the firstling fruits.” [the author will go to some length to explain that the ending כם in the word שבועותיכם in verse 26 does not refer to that festival. Ed.] Neither do we find the expression סכותיכם, etc.
The reason for this ancient custom of treating the day of the new moon almost like a festival is that historically, success of the Jewish people in matters terrestrial has always been linked to the lunar cycle. The moon is a phenomenon which has no light of its own, a phenomenon which depends on receiving and reflecting light from an external source.
Although prior to the sin of the golden calf the Jewish people’s fate was totally independent of any foreign domination, described as חרות על הלוחות, a kind of absolute independence, freedom engraved on the Tablets (the first set no doubt), (compare Exodus 32,16) as well as Eyruvin 54 and Tanchuma, Ki Tissa 16), once they had sinned they (divested themselves of this privilege, (and) no longer made use of this “Royal crown” at all times as did the other nations, so that they did no longer appear to enjoy this advantage over the other nations of the world.
Ever since that spiritual disaster, the Jewish people could enjoy their original privilege of independence from the restrictions imposed by the fact that one is part of the “laws of nature” only on rare occasions in their history, whereas most of the time they were dependent on “light”, i.e. good fortune, from external sources not under their control. To that extent, their history reflects the situation of the moon with its periods of ascent and decline month after month. When the moon is not directly exposed to the light of the sun it becomes invisible. The expression אין מזל לישראל, (Shabbat 126) means that the Jewish people do not generate light of their own, do not work at being masters of their own fate, but rely entirely on G’d to guide their fates. They receive this Divinely emanated light when their deeds are pleasing to G’d.
This is why in the parlance of our prophets G’d Himself is referred to as: “אור ישראל” Israel’s source of light. (compare Isaiah 10,16 as well as Psalms 27,1 where David refers to G’d. as אורי וישעי, “my light and my salvation.”)
Whenever the Jewish people are in a state of sin, their sins act as a barrier between them and their G’d so that they are deprived of their source of light. When Isaiah describes their state of being when sinful, he speaks of their G’d’s hiding His face from them, as Israel walking in darkness harassed by the gentile nations. (Isaiah 59,2).
Whenever the Jewish people’s fortunes are at low ebb this represents a desecration of G’d’s name, i.e. His reputation, as the gentiles refer to us sneeringly as עם ה' אלה “are these the ones who describe themselves as G’d’s special nation?” We can understand what our sages have said in Gittin 58 that whenever the Jewish people are in trouble, G’d is automatically forced to share their troubles. Having linked His honour to the honour and glory of the Jewish people, He suffers with us, (allegorically speaking). Whenever we suffer, whenever we are in a state of being oppressed, G’d is described as saying that “the pirate has attacked Me and you simultaneously.”
Seeing that the sin offering presented on New Moon’s day is an atonement for the Jewish people who are the cause of preventing the light of the moon to shine, or the reason it shines so weakly when it does shine, the sages in our prayers on that day referred to that sin offering as לכפר בעדם זכרון לכולם יהיו תשועת נפשם מיד שונא, “to obtain atonement for themselves. They were to be a memorial for them all, and a salvation for their soul from the hand of the enemy.” This is the reason that this is the only sin offering described as חטאת לה', “a sin offering on behalf of G’d.” Presentation of this offering is also in respect of the damage the sinful behaviour of the Jewish people has inflicted on G’d’s image among the gentile nations.
When we read about the dialogue described between the moon and G’d in Chulin 60, where G’d is eventually described as saying to the Jewish people “bring a sin offering on My behalf,” (in expiation for My diminishing the light of the moon) what the sage (Rabbi Shimon ben Pezzi) wanted to explain by putting such strange sounding words in G’d’s mouth is that ultimately the reason why the moon was diminished was because seeing it has a kinship with the Jewish people and these did not always live up to their lofty destiny, the moon [as a celestial representative of G’d Himself, Ed.] therefore has to suffer alongside with them for their shortcomings. Seeing this may not sound quite fair, G’d allegorically ordered a sin offering to be brought by the Jewish people on New Moon’s day in order appease the moon.

ובראשי חדשיכם, and on your new moons, etc. The suffix "your" is used to remind us that it is up to a collegium of terrestrial judges to determine the date the new moon should be celebrated.

ובראשי חדשיכם, “and on your New Moons, etc.” Some commentators understand this verse as applying to the New Moon of the month of Nissan, seeing that the New Moon of that month has been described asראשון הוא לכם לחדשי השנה, “it is the first New Moon for you of the moons of the year.” (Exodus 12,2) This would explain why the Torah concludes (verse 14) our paragraph with זאת עולת חדש בחדשו לחדשי השנה, ”this is the burnt offering of each New Moon on the successive moons of the year.”