Moshe on such a high level no direct involvement in sin. Moshe as leader, extends himself to a low domain. Moshe set aside 3 cities of refuge: Rambam implies only preparation in some way. Rashi implies he made a designation which would be valid retroactively.
Tefillin of the arm – service of Midos; Tefillin of the head – service of the mind in a way of constancy. Midos should follow the mind. Sefer Ahavah (Rambam) is regarding Mitzvos that result in constant love & remembrance of G-d. The Head tefillin which is the main part of the Mitzvah stresses the concept of constant מוחין & is mentioned prior to the Tefillin of the arm.
- ארבעה בתים רש"י ולטוטפות בין עיניך ידכה לאות על והיה שמות יג ,טז
- מנין פרשיותיהם רש"י לטוטפות בין עיניך והיולאות על ידך וקשרתם דברים ו ,ח
Shmos
Indicates focus of the pair as one unit towards remembrance of our going out of Egypt והיה. Hand is the power of deed even to the “left” side, place where deeds are the weakest ידכה. Emphasis on four batim - in the first 40 years of the desert the head Tefillin contained two batim with parshiyos and two empty batim; the increased number of batim enlarged the remembrance רש"י.
Dvarim
Plural refers to these words of the different parshiyos and not a single unit והיו. Establishes distinction between tefillin of the head and of the arm וקשרתם. Previously only 4 batim; now, four also applies to the count of parshiyos רש"י.
In Shmos the pair of Tefillin appear as one unit; in D’varim appear as separate. Arm alludes to middos and head alludes to mochin, each having own function. But the ultimate aim is to harness both and operate together as one unit.
