Our Sages, of blessed memory, established a rule: every place in the biblical text where the word 'Li-for Me' is written refers to something that will last forever into eternity.
That is, wherever Hashem applies the term "for Me" to something, that thing will remain forever.
One of the examples our Sages, of blessed memory, bring in this regard is the Tabernacle (Mishkan) and the Sanctuary (Mikdash), concerning which it is said:2 "And they shall make for Me a Sanctuary," to which our Sages3 add: "It will not be moved until eternity, neither in this world nor in the world to come." This requires explanation, since the Holy Temple (Beit HaMikdash) was destroyed. How can it then be said that it will not be moved until eternity?
Furthermore: Not only was the Beit HaMikdash itself destroyed; the commandment "And make for Me a Sanctuary" is no longer in effect, since it is not within our power to build a Mikdash for Hashem now!
A SMALL SANCTUARY
One explanation is based on verse 4, "And it shall be for them a small sanctuary," about which our Sages, of blessed memory, said: this refers to "Houses of Prayer and Houses of Torah Study." Therefore, when Jews build a synagogue or a Beit Midrash, that place becomes a small sanctuary where the Divine Presence resides. In this way, the sanctuary endures permanently.
Based on this explanation, it is understood that the commandment "And you shall make for Me a sanctuary" is always in effect, since even when the Holy Temple in Jerusalem is no longer standing, the obligation of the Jewish people to erect and establish a place dedicated to the Most High in every place where Jews are found remains in force, which are synagogues and houses of Torah study. In this way, the words of our Sages, of blessed memory, regarding the eternal permanence of the Sanctuary, over which it is written "for Me," are fulfilled.
A SANCTUARY IN THE HOME
Furthermore, the eternal existence of the Sanctuary will be understood based on the saying of our Sages, of blessed memory, regarding verse 7: "And they shall make for Me a Sanctuary, and I will dwell in them—it is not written 'I will dwell in it' but 'in them,' that is, within each individual Jew." In other words, each Jew was entrusted with erecting within himself and within his home a Sanctuary for the Most High.
To fulfill this commandment, a quorum of ten Jews (minyan) is not even required. Every Jew can and should set aside a place and time in their home to study Torah and pray, thereby creating a sanctuary for God in their private house. This is not limited to a specific time or place, and is therefore eternal.
THE THREE PILLARS
In addition, the Sanctuary included the three pillars upon which the world is sustained8: The Torah—through the Tablets of the Law and the Ark, as well as the Sanhedrin that was installed in the Lishkat Hagazit; Avodah—the service of Offerings and Prayer that took place in the Temple; and Acts of Benevolence—the flow of kindness that emanated from the Holy Temple through the 'Table' (with the 12 loaves of the Lechem HaPanim) and the charitable works that operated there.
Similarly, the individual Sanctuary that must be erected in the home of every Jew must include these three pillars - that Torah is studied there, that prayers are offered to Hashem (blessings and prayers that are not performed in public), that donations are made to charity (including by placing a Tzedakah collection box in the home), and that there is ample opportunity to receive guests.
This is how one's personal home becomes a Sanctuary for Hashem, and this is the preparation for the Divine revelation that will take place in the general Sanctuary, the Third, an eternal and immovable construction, for eternity, in its most literal and tangible sense, with the arrival of Mashiach Tzidkeinu.
(Likutei Sichot Volume 36, Page 123)
NOTES: 1. Sifri BeHaalotecha 11:16 (Brought in Yalkut Shimoni) - in our Parashah 2. Exodus 25:8 3. Vayikra Rabbah 82b 4. Ezekiel 11:16 (See Rashi and the Targum there) 5. Megillah 29a 6. Alshich on the verse near the end. Reshit Chochmah Shaar HaAhavah Chapter 6, near the beginning. Shalo (69a, 201a, 325b, 326b, and elsewhere) 7. Exodus there 8. Avot Chapter 1, Mishnah 2