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What is the meaning of "mi'Mochoras ha'Pesach"?
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Rashi (in Re'ei, Devarim, 16:1): It refers to the fifteenth of Nisan
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Chizkuni: Shechitas ha'Pesach takes place on the day of the 14th, and it is eaten that night; these are called Pesach. The festival itself is called 'Chag ha'Matzos'.