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. 06-09-25 ; 06-10-25 ; 06-11-25 ; 06-12-25 The Question We wear Tefillin every weekday morning, but we do not don Tefillin on Shabbat or Yom Tob. Why is that? What makes these days different, and what is the source for this practice? Tefillin as an 'Ot'—a Sign The Torah describes Tefillin as an Ot—a sign between Hashem and the Jewish people. In Shemot (13:9), Tefillin are called "a sign upon your arm and between your eyes." Shabbat and Yom Tob themselves are also referred to as an Ot. They serve as a sign of the covenant between Hashem and Am Yisrael. This is clearly stated in Shemot (31:13): "Ach et Shabbetotai tishmoru … ki Ot hi." If the day itself serves as a sign, then Tefillin are not needed. The presence of one Ot (Shabbat or Yom Tob) renders a second Ot (Tefillin) unnecessary. This is the foundational reason why Tefillin are not worn on these days. Gemara and Halachic Sources The Gemara ( Masechet Eruvin 96a) brings a Baraita: "One may not wear Tefillin on Shabbat and Yom Tob." Rashi explains that since these days are already an Ot, we do not add another. Rambam (Hilchot Tefillin 4:10) and Shulhan Aruch (Orah Haim 31:1) both rule accordingly: Tefillin are worn only on weekdays. Ramban's Explanation: Avdut vs. Herut The Ramban adds another dimension: Tefillin symbolize Avdut —our servitude to Hashem. They demonstrate submission of mind and body to His will. Shabbat and Yom Tob, by contrast, represent Herut—spiritual freedom. On these days, we are elevated, likened to royalty. A slave wears signs of his service, but a free person or a king does not wear the garments of servitude. Therefore, Tefillin are set aside on these days of elevated spiritual status. Kabbalistic Explanation According to Kabbalah, the spiritual light of Shabbat and Yom Tob themselves provides all the blessings and protections that Tefillin typically bring. The Arizal taught that the Kedusha of these days is so great that Tefillin are not only unnecessary, but may even detract from the spiritual light of the day. Summary • Tefillin are not worn on Shabbat or Yom Tob because those days themselves are an Ot. • The Gemara , Rambam, and Shulhan Aruch rule that Tefillin are only for weekdays. • The Ramban explains that Tefillin reflect servitude, while Shabbat and Yom Tob reflect spiritual freedom. • According to Kabbalah, these days emit their own light and blessing, making Tefillin spiritually redundant.