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Why do we not put on Tefillin on Shabbos?

Why is one not allowed to put on Tefillin on Shabbos?

And similarly, why is Tefillin Muktzah?

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1 Answer

up vote 10 down vote accepted

It is prohibited to put on tefillin on Shabbos and Yom tov, since tefillin are called אות (Shemos 13:9), and so is Shabbos (Shemos 31:17). Thus, donning tefillin is disrespect (זלזול) to the אות of Shabbos. (Shulchan Aruch, OC 31:1)

There is discussion amongst the poskim if, because tefillin are assur to wear, they should fall into the category of k'li shem'lachto l'issur (object designed for a prohibited use) on Shabbos. Mishna Berura (31:2) rules that one should consider them muktza, but may move them if necessary (בשעת הדחק), such as if they might fall on the ground or be stolen.

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I think R.H. Shechter holds they're muktzah machmos chisaron kis. –  Ariel K May 23 '11 at 22:27
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