The day 27 Adar (כ”ז אדר ראשון) is not just a date in Lubavitch — it has become a title for the dramatic day that was the beginning of a new reality for Chassidim. This is the day that the Rebbe had what the doctors call a stroke, and since then we have not heard from the Rebbe. Gimmel Tammuz is another step, but the “silence” began on this day, Chof Zayin Adar.
The number 27 in Loshon Hakodesh is also the word “זך”, which means refined and purified. In fact, the Rebbe connects this with the 27th day of the month, in a sicha of Parshas Pekudei 5750 (2 years to the day before the stroke). Here the Rebbe explains that the 27th of the month possesses the special quality of:

…scouring and clarification and purification, as is written about the time of the Geuloh “many will be clarified and whitened and purified” (Daniel 12:10). The ultimate scouring and purification is by revealing the intent in the Tzimtzum [contraction of G-dly revelation] and concealment of the Divine name Elokim itself.
This will be understood in light of what the Rebbe explained in the earlier parts of this sicha. To summarize:
According to Torah, there are 7 names of Hashem that one is forbidden to erase due to their Holiness. Of them, we primarily relate to two names: YKVK and Elokim, which represent the revelation of G-dliness (the name YKVK) and the concealment of that revelation (the name Elokim). The name Elokim is the contraction and concealment of G-dly light — in other words: darkness. We find a verse in Tehillim “the sun and its shield, YKVK Elokim”, explained to mean that Elokim (concealment) is like a shield or a filter that reduces the G-dly revelation of the name YKVK so that the worlds are not nullified out of existence. According to this, the name Elokim, the contraction and concealment of G-dly light (the darkness), is for the sake of being able to reveal G-dliness within the limited ability of the worlds to receive. Like smoked glass diminishes the light of the sun but this itself allows a person to be able to gaze at the sun without being blinded. A concealment which has the intent of actually revealing that which is being concealed.
But, explains the Rebbe, there is another dimension: the quality of Continue reading
It is brought in the writings of the Arizal that the generation of the future Geuloh is a gilgul (reincarnation) of the generation that came out of Egypt, and according to this, we are redeemed in the merit of the righteous women in our generation, for they themselves are the righteous women in whose merit we came out of Egypt.
The completion and perfection of the avodah (spiritual mission) of the Nosi Hador (on his Yom Hahillula [day of his passing –Yud Shevat]) is the completion and perfection of the avodah of the entire generation (for