Beis Rabbeinu and the Significance of 770
This number in Gematria is "Paratzta," derived from "You shall spread out [U'Faratzta] west and east and north and south."
This indicates that from this house light will go forth to all four corners of the world, in a manner of breaking through barriers, so that all four corners of the world will be elevated to the status of the land of Israel. (In the future the land of Israel will extend to all the lands.) This means in particular that all the synagogues and study halls throughout the world will be established in the land of Israel and connected to the Beis HaMikdash in the true and complete Redemption through our righteous Moshiach. For about him it says, "You have broken barriers for yourself," which our Sages of blessed memory explain as follows: "This is Moshiach, about whom it is said, 'The breaker is come up before them.'"
...In the completeness of the number seven (seven hundred and seventy) can also be found an allusion to the completeness of the Divine service of our Rebbe during his complete lifetime of seven decades, seventy years (5640-5710). His Divine service was concluded and completed in the lower hemisphere in the seventh decade (from the house whose number is seven hundred seventy). [This completeness] includes as well the extension of his Divine service in the years afterwards, through the seventh generation - so in regard to an established dwelling). This is particularly true in our case, when the number becomes the name of the house, as discussed below.
The Name and Its Allusions
It may be added, that this concept is also alluded to in the name of "Beis Rabbeinu" in our generation:
- Rabbeinu [our Rebbe] - His two names alluded to the Redemption: His first name - Yosef - "And it shall come to pass that on that day, the L-rd shall continue to apply [yoseef] His hand a second time to acquire the rest of His people that will remain from Assyria and Egypt, etc. and from the islands of the sea, etc, and He shall gather [Asaf] the lost of Israel and the scattered ones of Judah He shall gather from the four corners of the earth."
- His second name - Yitzchak - refers to the laughter and rejoicing that will be complete in the future Redemption, and which will be completed through our righteous Moshiach. Thus it is written, "Then our mouths will be filled with laughter [S'chok]. It specifies 'then,' in the future, when they will say to Yitzchak (specifically), 'Because you are our father.'"
And Beis (Rabbeinu) [The House of our Rebbe] - its number is seven hundred seventy.
The name by which "Beis Rabbeinu" is called by all Jews has been universally accepted to be this number, whether in Hebrew, Yiddish or English - "Seven Seventy."
