The Medrash says that Moshe Rabbeinu asked Hashem, if the Bais HaMikdash is destroyed where will Hashem's Shechina rest. Hashem answered that it will rest on the Tzadikim of each generation. The Gemara in Succah (45b) says that each generation has 36 tzaddikim that greet the Shechina every day.
Rav Shlomo Levenstein in Chaim Shel Torah says there is a Remez to this in the first words of Parshas Pikudei. Pikudei according to many Meforshim means "missing" or "lacking". Eileh is gematria 36. "Eileh Pikudei HaMishkan". What will happen with the Shechina when "Pikudei HaMishkan", when the Mishkan is missing, asks the Torah? Eileh, the Shechina will rest among the 36 tzaddikim.
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