The Halacha below was generated by AI based on multiple classes given by Rabbi Eli Mansour in the Bekiim B'Halacha series. Click on any of the dates below to hear the original audio file. This write-up has been reviewed, but if any errors remain, we welcome corrections.
06-01-25; 06-04-25; 06-05-25; 06-08-25
May a Sofer Write or Assemble Tefillin at Night?
The Question
Is it permissible for a sofer (scribe) to write or assemble Tefillin at night?
And if one does so, is the Tefillin considered valid? This question impacts
sofrim, and purchasers of Tefillin, especially when Tefillin are urgently
needed or produced under pressure.
Writing Tefillin at Night
The Gemara discusses whether writing Tefillin at night is allowed. The Halacha
ultimately rules that it is permissible for a sofer to write Tefillin at night,
provided he has proper lighting and kavana. However, the process of assembling
Tefillin—particularly inserting the written parchments into the batim
(boxes)—is a separate issue.
The Rule of Ta'aseh Ve'lo Min He'asuy
The Torah commands that a Misva be done actively—Ta'aseh—and not passively—Min
He'asuy. If the Misva comes into being on its own without direct intent or
action, it is invalid. This principle is critical when it comes to assembling
Tefillin.
Some Poskim argue that if the batim are sealed or completed at night in a
manner that finishes the Tefillin, this could violate the rule of Ta'aseh Ve'lo
Min He'asuy, especially if done without the proper kavanot. Therefore, writing
the parshiot (scrolls) at night is permitted, but assembling them at night is
subject to debate.
Comparison to Tzitzit and the Tallet
This question is similar to the issue of tying Tzitzit onto a Tallet at night.
There, too, some opinions require the Misva to be performed during the day to
satisfy the criteria of Ta'aseh Ve'lo Min He'asuy, while others are more
lenient if the proper intent is present. The same applies here to Tefillin
assembly.
Lechatehila vs. Bediavad
• Lechatehila (ideal practice): One should not assemble Tefillin at night. The
parts can be prepared, but final assembly should be done during the day.
• Bediavad (a permissible leniency, though it is not the preferred approach):
If Tefillin were assembled at night, they are still valid according to many
opinions, especially if done properly with intent and lighting.
Kabbalistic Considerations
Although the Halacha allows writing Tefillin at night, some kabbalistic sources
discourage it. Nighttime is considered a time of judgment and impurity, not
ideal for producing sacred items. Still, this is not binding Halacha, and the
written Tefillin remain kosher.
Summary
• Writing Tefillin at night is
permitted, though some prefer to avoid it based on Kabbalah.
• Assembling Tefillin at night is not
ideal, but permitted Bediavad, as long as it is done properly.
• The rule of Ta'aseh Ve'lo Min He'asuy
applies when the Misva comes into being without proper action, and care must be
taken not to violate it.
• Best practice: Do the final assembly
during daylight hours to avoid all concerns.