The Mechilta (Parshat Bo) and Haggadah posit (though ultimately reject) the notion that the mitzvah of sippur yetziat Mitzrayim (“vehigadeta le-bincha”- Shemot 13:8) might commence already at rosh chodesh Nissan (“yachol mei-rosh chodesh”)! This suggestion is particularly striking in light of the subtle yet consistent focus on the actual event and anniversary of yetziat Mitzrayim in all the parshiyot (Bo, Emor, Pinhas, Reeh etc.) that present Chag Hamatzot. This emphasis is further reinforced by numerous halachic norms that define the festival. [See, for example, the korbonot configuration, Hallel recitation (Arachin 10a-b), the principle of linah, the status of its chol hamoed etc. I hope to elaborate this issue, especially as a sharp contrast to the otherwise parallel weeklong 15-15 holiday of Sukkot, elsewhere.] The halachic conclusion does confine sippur yetziat Mitzrayim to “bayom hahu” and even more specifically “beshaah she-yesh matzah umaror munachim lefanecha”, but the very consideration of a more expansive time frame, and particularly of rosh chodesh, is intriguing.
It is conceivable, as some rishonim (Ritva on Haggadah) posit, that “yachol mei-rosh chodesh” reflects the stance of R. Shimon b. Gamliel (Pesachim 6a-b) who asserted, based on his understanding of the Moshe - Aharon paradigm (Shemot 12:1-3) in Parshat Bo, that rosh chodesh Nissan is the appropriate time to plan and prepare for chag ha-matzot - “shoalim vedorshim be-hilchot ha-Pesach shetai shabatot”. However, this more pragmatic directive does not obviously come under the rubric of “ve-higadeta le-bincha”, the essential sippur yetziat Mitzrayim.
Yet, the broader temporal horizon for sippur yetziat Mitzrayim already registers in the Torah’s presentation of parshat ha-chodesh, the section in Parshat Bo that is a special reading prior to rosh chodesh Nissan. The Torah (Shemot 12:2, 3) introduces the lunar calendar, perceived by Chazal as significant substantive and symbolic manifestation of Am Yisrael’s distinctive character and destiny (lachem, velo le-umot ha-olam, Yisrael monim lelevanah etc.), by underscoring that chodesh Nissan is both the preeminent month (rosh hadashim - see Ohr haChayim, Netziv, Malbim), as well as the first and tone-setter of all the months (rishon hu lachem). This transformative directive which amounts to a pivotal perspective on time, freedom, responsibility, and Divine providence {as we shall briefly discuss} remarkably serves as the background or, more perhaps more accurately, the foundation for specific norms regarding the korban Pesach and yetziat Mitzrayim (12:3…). In the verses that follow, the Torah, seemingly superfluously, repeatedly reminds us that the events and directives are situated in this specific month (ba-chodesh ha-rishon, bechodesh ha-zeh). Occasionally, the Torah conveys information about the exodus and its halachic expressions by referring exclusively to chodesh Nissan (Shemot 13:4,5): “hayom atem yotzeim ba-chodesh ha-aviv…ve-avadeta et ha-avodah ha-zot ba-chodesh ha-zeh”. In parshat Reeh (Devarim 16:1), the Torah omits any reference to a formal date, instead underscoring the month unit: “Shamor et chodesh ha-aviv veasita pesach la-Hashem Elokecha. Ki be-chodesh ha-aviv hotzi’acha Hashem Elokecha mi-Mitzrayim laylah”.
It is evident that the preeminence of this month vis a vis all others - rosh and rishon - is due to the events and implications of yetziat Mitzrayim that define the distinctive destiny of Am Yisrael. It is equally evident that the relationship is a reciprocal one, that the institution and implications of kiddush ha-chodesh and the exclusive adoption of the lunar calendar by the yotzei Mitzrayim crystallized the singular aspirations of the fledgling Jewish nation for all times.
On one plane, kiddush ha-chodesh highlights time consciousness. Rav Soloveitchik explored the link between time consciousness and liberty. A slave has no control over his time. True liberty may entail even a role in determining the calendar. Orchot Chayim (Hilchot Pesach) explains “yachol mei-rosh chodesh” by noting that one dimension of the geulah began already on rosh chodesh. Chazal perceive chodesh Nissan as the month of redemption (“be-Nissan nigalu, u-be-Nissan atidin ligael”). Perhaps the transition to a different calendar mode and the perspective on time it implied was itself a redemptive dimension.
Furthermore, many mefarshim note that the astrological symbol of Nissan was perceived to be linked to the Egyptian deity. Malbim suggests that Pharaoh stubbornly withstood the month-long makkot in anticipation that this month would ensure his survival. In this respect the month-factor underscores not only his dashed expectations, but the vanquishing of idolatry, as well as the notion of astrological determinism. Instead, the principles of human freedom and Divine providence emerged with remarkable clarity. The shift from a solar to a lunar calendar reinforced the theme of renewal, change, and growth, linchpins of avodat Hashem rooted in the capacity of bechirah and the volitional surrender to Hashem’s will, the very core concept of mitzvot. In this respect, it is noteworthy that Ravan, Ritva and Netziv (on the hagadah) invoke the previously cited biblical references to “chodesh ha-aviv” and “ha-chodesh ha-zeh” in their efforts to justify “yachol mei-rosh Chodesh”. R’ Bechaya renders “aviv” as “av le-yud beit chodesh”, highlighting Nissan’s special status in the context of its role as a factor in the substance of sippur yetziat Mitzrayim.
Finally, kiddush ha-chodesh, first established and defined by chodesh Nissan, projects Am Yisrael’s active participation in and responsibility for kedushat ha-zeman, and by extension the moadim (see Emor ch. 23 and Ramban, as well as Betzah 17a), and other facets of avodat Hashem. The procedure of kiddush al pi reiyah (visual calculation), and the limited legal flexibility of the beit din to dictate the calendar are acutely emblematic of the unique halachic world view that was to be initiated by the exodus, which, as Ramban (parshat Bo and throughout his works) so magnificently articulates, encapsulates not only Divine existence and omnipotence, but also a unique providential and direct relationship with Am Yisrael. From this perspective, too, Chodesh Nissan qualifies as an extended period of yetziat Mitzrayim, and as an appropriate (albeit ultimately rejected) candidate for initiating the hagadah process.
Rashi begins his commentary on the Torah by noting that “ha-chodesh ha-zeh lachem”, the first mitzvah addressed to Am Yisrael, might have been an appropriate starting point for the Torah itself. In light of our brief analysis, we can better comprehend why this specific imperative attains such prominence, as it encapsulates the unique charge and destiny of Am Yisrael and crystalizes the consequential impact of yetziat Mitzrayim in molding a nation deserving of the appellation “mamlechet kohanim ve-am Kadosh”. [Some (see Rinat Yitzhak Shemot 12:2) have questioned how kiddush ha-chodesh can be labelled the first national mitzvah in light of the evidence (see Maharal, Tiferet Yisrael ch. 17, Netziv, Intro to Shemot and others) that it was yetziat Mitzrayim that engendered the status of Jewish nationhood? The convergence of kiddush ha-chodesh and yetziat Mitzrayim, established subtly but compellingly in parshat Bo, Reeh, and elsewhere may satisfactorily resolve this issue, as well.]