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THE SET FEASTS OF THE LORD WHICH YE SHALL PROCLAIM TO BE HOLY CONVOCATIONS. R. Isaac said: It is written, “And God called the light day” (Gen. 1, 5). Does this mean that the light called day exists by itself? No, for it says, “and the darkness he called night”.
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Does this mean that each exists separately? No, for it says, “And there was evening and there was morning one day”. This shows that there is no day without night and no night without day, and on account of their interlocking they are called one. Similarly the Holy One, blessed be He, and the Community of Israel are called one when together, but not when parted;
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and so now that the Community of Israel is in exile, she is, as it were, not called one, and will only be called one when Israel emerge from captivity.
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Similarly it says: “These are the appointed feasts of the Lord which ye shall proclaim” (lit. call), that is, invite all to one place so that all shall form one, and Israel below shall be one nation on the earth.
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And how will they be called one? Through the earthly Jerusalem, as it is written, “And who is like thy people Israel one nation in the earth” (2 Sam. 7, 23), since they are only called one when wedded to this “earth”, after the supernal pattern.’