Mishneh Torah, Tefillin, Mezuzah and the Torah Scroll 4

Sugya Map

• Issue: The halakhic status of tefillin as a temporal commandment (mitzvah she-hazman gerama) vs. a constant obligation.
• Nafka Minah: Whether the prohibition against wearing tefillin at night or on holidays is a lav (negative commandment) or a rabbinic restriction.
• Primary Sources: Menachot 36b; Mishneh Torah, Hilkhot Tefillin 4:10–11.

Text Snapshot

"זְמַן הַנָּחַת תְּפִלִּין בַּיּוֹם וְלֹא בַּלָּיְלָה שֶׁנֶּאֱמַר (שמות יג, י) וְשָׁמַרְתָּ אֶת הַחֻקָּה הַזֹּאת לְמוֹעֲדָהּ מִיָּמִים יָמִימָה. חֻקָּה זוֹ הִיא מִצְוַת תְּפִלִּין... כָּל הַמֵּנִיחַ תְּפִלִּין לְכַתְּחִלָּה אַחַר שְׁקִיעַת הַחַמָּה עוֹבֵר בְּלָאו." (MT Tefillin 4:10).

Leshon Nuance: The Rambam parses "from day to day" (mi-yamim yamimah) as an exclusionary clause. Unlike the simple reading (peshat) in Exodus which pertains to the Pascal sacrifice, Rambam follows R' Yose ha-Gelili, binding the tefillin mandate exclusively to the diurnal cycle.

Readings

• Rambam (Sefer HaMitzvot): Treats the avoidance of tefillin at night as a lav derived from the word hukah. The chiddush is the elevation of a "negative derived from a positive" (lav ha-ba miklal aseh) to a formal prohibition.
• Sha'ar HaMelekh (ad loc): Engages in lomdus regarding whether the lav applies if one simply fails to put them on during the day, or only when one actively puts them on at night. He concludes that the lav is triggered by the act of wearing them in the forbidden zone of the night.

Friction

Kushya: If the lav is derived from the positive mitzvah of tefillin, why does the Rambam impose a lav for wearing them at night? Usually, a lav derived from a positive commandment (lav ha-ba miklal aseh) functions like an aseh (no lashes for violation). Terutz: The Radbaz argues that the shemirah (guarding) language here is distinct; it is an independent prohibition to ensure the sanctity of the tefillin is not degraded by improper timing.

Intertext

• SA Orach Chayim 30: Codifies the Rambam’s ruling.
• Berakhot 18a: The concept that tefillin are a sign (ot), and when Shabbat provides its own ot, the tefillin become redundant—even potentially an affront to the Sabbath’s sanctity.

Psak/Practice

The meta-psak is clear: Tefillin are not merely ritual objects but a temporal state of being. Because we cannot maintain the "clean body" and "undivided attention" required by Hilkhot Tefillin 4:15 during the night or deep sleep, the halakha restricts their use to daylight hours.

Takeaway

Tefillin are a sign of covenantal alertness; if the covenant is already manifest (Shabbat) or the human capacity for vigilance is dimmed (night), the sign must be removed to preserve its honor.