We have seen that here is a mitzvah to mention yetzias Mitzrayim, both by day and by night, every day of the year.
Omission of the Rambam
The Acharonim point out that, although the Rambam discusses this mitzvah in the Mishneh Torah, he does not count it as one of the 613 mitzvos. One explanation given by many Acharonim is that this mitzvah is considered a sub-category of the mitzvah of sippur yetzias Mitzrayim on the Seder night, which the Rambam does count.
Part of the Mitzvos We Do on Pesach
The Acharonim add that this can be gleaned from the expression the Torah uses in describing the mitzvah of mentioning yetzias Mitzrayim, every day: שִׁבְעַת יָמִים תֹּאכַל עָלָיו מַצּוֹת לֶחֶם עֹנִי כִּי בְחִפָּזוֹן יָצָאתָ מֵאֶרֶץ מִצְרַיִם לְמַעַן תִּזְכֹּר אֶת יוֹם צֵאתְךָ מֵאֶרֶץ מִצְרַיִם כֹּל יְמֵי חַיֶּיךָ – “You shall eat matzos for seven days, because you went out from Egypt in a hurry, in order to that you remember the day that you left Egypt, all the days of your life.”
We see from this pasuk that the mitzvah that we do every day is a continuation of the mitzvos that we do on Pesach. That is why the Rambam may have understood that it is not to be counted as a separate entity, but as part and parcel of the mitzvah of sippur yetzias Mitzrayim. This is different from the mitzvah of kiddush on Shabbos, which the Torah writes clearly: “זָכוֹר אֶת יוֹם הַשַּׁבָּת לְקַדְּשׁוֹ – remember the day of Shabbos to sanctify it.” This is the source for the mitzvah of reciting kiddush, and since it is an independent mitzvah and not connected to any other mitzvah, it is counted as its own mitzvah.
But we must point out that there is a different pasuk in Parshas Bo (13:3), which may also discuss this mitzvah, and does not connect it to the mitzvah of the seder night. The pasuk says: זָכוֹר אֶת הַיּוֹם הַזֶּה אֲשֶׁר יְצָאתֶם מִמִּצְרַיִם מִבֵּית עֲ בָ דִ ים – “remember the day that you went out of Egypt.” Rashi quoted the Mechilta that this teaches us the mitzvah of mentioning yetzias Mitzrayim every day, without any mention of the mitzvos of the seder night. That seems to contradict what we just said that it is not counted as a separate entity, since it is part and parcel of the mitzvah of sippur yetzias Mitzrayim. However, in truth, this Mechilta seems to be in variance with our Gemara in Brochos, which learns this mitzvah from the pasuk in Re’ah, and not from the pasuk in Parsha Bo.
Only Counts Eternal Mitzvos
There is another explanation given by Rav Chaim Brisker as to why the Rambam does not count the mitzvah of mentioning yetzias Mitzrayim every day as one of the 613 mitzvos. The Rambam writes that he only counted mitzvos which were for eternity, and did not count any mitzvah which was only kept for a limited time. We follow Ben Zoma that the mitzvah applies at night, and not the Chachamim, who learn that the mitzvah will still be applicable when Moshiach comes. Since the mitzvah will no longer be applicable when Moshiach comes, it is not counted as one of the 613 mitzvos.
Summary
The Rambam does not count the mitzvah of mentioning yetzias Mitzrayim every night, either because it is an extension of the mitzvah of the seder night, or because we will not be obligated to do it when Moshiach comes.
