Tuesday Sivan 5, Erev Shavuot 5703, 49th day of the Omer
Chumash: Nasso, Shlishi with Rashi.
Tehillim: 29-34.
Tanya: And this is (p. 279)...BLESSED AND EXALTED. (p. 281).
On the eve of Shavuot 5557 (1797) the Alter Rebbe taught:
"Sanctify them today and tomorrow and they shall cleanse their garments. [1]
"Sanctify them today and tomorrow," is done from Above, but "they shall cleanse their garments" - one must do himself."
This was the entire teaching.
The Tzemach Tzedek elaborated:
"Sanctify them" was said by G-d to Moshe. The extension of Moshe is in every generation [2] and they [3] are able to sanctify the "today" and the "tomorrow"; but for this is needed "..and they shall cleanse their garments" - the garments of thought, speech and deed. This must be done by each person on his own.
Notes:
Sh'mot 19:10.
Tikunei Zohar, Tikun 69.
I.e. the Moshe in each generation.