What is the meaning and importance of the mitzvah of tefillin?

What is the meaning and importance of the mitzvah of tefillin?

The mitzvah of tefillin involves four passages from the Torah: "Kadesh Li," "V'hayah ki y'viacha Ado-nai" (Exodus 13:1-10, 13:11-16), "Shema," and "V'hayah im shamo'a" (Deuteronomy 6:4-9, 11:13-21) [4]. Tefillin generally correspond to the intellect, with those of Rabbeinu Tam specifically relating to the conception of words [5]. The act of putting on tefillin is a significant milestone, as noted when a son begins to fulfill this mitzvah [2].

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