מה זֹאת חֻקַּת הַּפָּרָה: Which would imply that it is a statute regarding the specific Mitzvah of the ‘Poroh Adumah’.
The whole Torah: And the spiritual significance of the Mitzvah of Poroh Adumah actually exists in the whole of Torah and in all of the Mitzvos.
The Alter Rebbe explains: In Likkutei Torah ibid.
Mitzvos generally: The essence of all Mitzvos as opposed to just the Mitzvah of ‘Poroh Adumah’.
Advancing and retreat: ‘Aspiration and relinquish’ or ‘ebb and flow’. The term רָ צוֹא וָשוֹב come from the vision of Yechezkel when he describes the supernal chariot and the holy Chayos angels in the upper spheres. The Possuk says: וְּהַּחַּיוֹת רָצוֹא וָשוֹב כְּמַּרְּ אֵה הַּבָזָק “And the Chayos angels would run and return, like the appearance of the sparks” in other words, these angels have a burning desire and are yearning to self-nullify and integrate into G-dliness which is the רָצוֹא and then they return to fulfil their purpose which is the שוֹב. In Chassidus it is explained that this concept exists in every person’s Avodas Hashem, there is רָצוֹא the yearning of his Neshomoh to cleave to G-dliness and to ascend from the limitations of the body and of the physical world to the extent of demise. And שוֹב is the limitation of that motion of the Neshomoh and a return to fulfil his worldly mission of studying Torah and performing Mitzvos in this physical world.
Explained in Likkutei Torah: This is an excerpt from what it says there in Likkkutei Torah: “The general concept of performing Mitzvos is to draw upon the person doing the Mitzvah a sense of what is written about “The holy Chayos angels וְּהַּחַּיוֹת רָצוֹא וָשוֹב” ..... the want and the yearning to cleave to Hashem blessed be He to Mamosh become incorporated and nullified to Hashem blessed be He... רָצוֹא is the element of fire within the heart ... and thereafter ... שוֹב which is the state of ‘Yirah’ and ‘Bittul’ from a higher level than the state of ‘Ahavah’ which is the element of water in the brain .... But how does a person attain this state? It is through the performance of Mitzvos.”
