Who knows two hundred five?
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Well we are in the month of Adar
Adar = 205
Avraham's father Terach died at the age of 205. Bereishit 11:32
Avraham Avinu called the Makom HaMikdash "Har". Har = 205
Yitchok Avinu called it "Sadeh"
Yaakov Avinu called it "Bayis"
Avraham Avinu came and prayed on the place where the Temple was to be, opposite the heavenly Temple, and with his prayers he added an additional wall to the heavenly Temple -- a second Machaneh of angels. Machaneh (103) plus Machaneh (another 103) equals 206. That is why Avraham called it a "Har" [= mountain], the Gematria of which is 205 (He = 5, Resh = 200. One of the rules of Gematria is that one may, at times, add 1 to the combined numerical value of a word's letters. This extra 1 corresponds to the word as a whole. Adding an extra 1 in such a manner is referred to as "Im Hakollel" [= with the total]. In such a manner, the word "Har" equals exactly 206, or 2x103.)
Yitzchak prayed there and added another Machaneh of angels to the Heavenly Beit Hamikdash, giving it a third "wall." Now that there were three Machanot, he referred to it as a "Sadeh" [= field] which has the Gematria of 309 (Sin = 300, Dalet = 4, He = 5), or three times Machaneh (103).
When Yakov prayed there he added a fourth wall, making it a "Bayit" [= house], which has the Gematria of four times Machaneh (103), or 412 (Beit = 2, Yud = 10, Taf = 400).
The Belzer Rebbe adds that the heavenly Beit Hamikdash did not yet have a ceiling -- just as the tabernacle in the desert had four walls but no ceiling, only a covering of cloth. Later on, before Moshe Rabbeinu was taken away from the Bnei Yisrael, he was shown all of Eretz Yisrael [= the Land of Israel], including the place of the Beit Hamikdash (Rashi, Devarim 3:25). At that time Moshe Rabbeinu also prayed for the completion of the heavenly Beit Hamikdash. He prayed using the word, "Va'etchanan [= and I pleaded]" (Devarim 3:23). He used this word because his prayer was to add a ceiling -- a fifth Machaneh of angels -- to the heavenly Beit Hamikdash. Five times Machaneh is 515, exactly the Gematria of "Va'etchanan" (Vav = 6, Alef = 1, Taf = 400, Chet = 8, Nun = 50, Nun = 50)!
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