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In parashath Paqudhei, the final parasha of Shemoth, Midrash Raba comments on the beginning of the parasha where the word 'mishkan' is doubled. It states, basically, that the Mishkan is related to the word 'mashkon', meaning a pledge or a loan. Thus as it's written in the Torah "mishkan, mishkan" and the Sages in M"R state to read it "mishkan, mashkon".