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.