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I know that we don’t need to wear tefillin on shabbos and Yom Tov because we only need 2 of the 3 signs to be fulfilled (tefillin, bris mila, And shabbos/ Yom Tov), and since we already have a bris mila and it’s shabbos, we don’t need to put on tefillin. (Source needed)

But why don’t we anyway? Just because we don’t need to put tefillin on, doesn’t mean we can’t.

Note: please do not answer that it was never done and therefore it was accepted as Halacha/ it became muktza because it has no use, as it could have been put on when this heter was first made, and through that become a minhag (think ma’ariv).

Please keep in mind that there is an argument in the Gemara whether tefillin is a mitzvas asei shehazman grama or not (kiddushin 35a), so according to one opinion, we should put tefillin on on shabbos, and the minhag (or Halacha) not to was codified since the Gemara.

marked as duplicate by Joel K, sabbahillel, mbloch, DonielF, Avrohom Yitzchok Sep 19 at 16:28

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  • **ושמרת את החקה הזאת **למועדה – Double AA Sep 19 at 11:33
  • Why don't we sit in a Sukkah all year? Just because we don't need to sit in a Sukkah doesn't mean we can't. – Double AA Sep 19 at 11:34
  • @doubleAA Why there is no mitzva to sit in a sukkah today is obvious: the passuk says בסוכת תשבו שבעת ימים. The reason why we don’t put tefillin on on shabbos is less so. The fact that there are 2 signs and we don’t need a third teaches us why there’s no chiyuv not why there’s no mitzva (mitzva meaning “thing we get credit for doing) – Lo ani Sep 19 at 17:02
  • @LoAni you've just made that up. I can just as easily counter with the made up claim that it's 7 days of chiyuv for Sukkah but it's still a mitzva the rest of the year. – Double AA Sep 19 at 17:05
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ערוך השולחן אורח חיים לא א-ב

ומכל מקום כתב רבינו הבית יוסף דבשבת ויום טוב אסור להניח תפילין מפני שהם עצמם אות,ואם מניחים בהם אות אחר היה זלזול לאות שלהם. עד כאן לשונו.
ואין הכוונה לאיסור תורה, אלא איסור משום בזיון שבת ויום טוב. והכי איתא במכילתא סוף פרשה י''ז... רבי יצחק אומר: הואיל ושבת קרויה ''אות'' ותפילין קרויין ''אות'' – לא יתן אות בתוך אות. ...

Aruch Hasulchan Orach-Haim 31:1-2

Anyway, The Beis Yossef wrote that during shabat and festivals, you don't put on teffilin, because they are a "sign", and if you put on another sign, you dishonor them, that his sayings.
And it's not that it Tora prohibition, but it's forbidden to dishonor shabat and festivals.
And in the Mechilta end of p17... R' Itzhak says because shabat is called "sign" and are Teffilin called "sign", don't put a sign within a sign...

  • This is pretty misleading since you don't openly reject the ops premise that wearing tefillin on shabbat is accomplishing a Mitzva but it's not worth it. But that's not true. Wearing tefillin on shabbat is no better than sitting in the sukkah on chanukkah AND it may be forbidden for other reasons. – Double AA Sep 19 at 13:08
  • @DoubleAA what are the other reasons? – Akiva___ Sep 19 at 15:36
  • @Akiva accd to this answer, degradation of Shabbat – Double AA Sep 19 at 16:00

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