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ויכל אלהים ביום השביעי. ר' שִׁמְעוֹן אוֹמֵר בָּשָׂר וָדָם, שֶׁאֵינוֹ יוֹדֵעַ עִתָּיו וּרְגָעָיו צָרִיך לְהוֹסִיף מֵחֹל עַל הַקֹּדֶשׁ, הַקָּבָּ"ה שֶׁיּוֹדֵעַ עִתָּיו וּרְגָעָיו, נִכְנָס בֹּו כְּחוּט הַשַּׂעֲרָה, וְנִרְאֶה כְאִלּוּ כִלָּה בוֹ בַיֹּום. דָּ"אַ מֶה הָיָה הָעוֹלָם חָסֵר? מְנוּחָה, בָּאת שַׁבָּת בָּאת מְנוּחָה, כָּלְתָה וְנִגְמְרָה הַמְּלָאכָה:

ויכל אלהים ביום השביעי AND ON THE SEVENTH DAY GOD FINISHED — R. Simeon says: A human being (literally, flesh and blood) who cannot know exactly his times and moments (who cannot accurately determine the point of time that marks the division between one period and that which follows it) must needs add from the week-day and observe it as the holy day (the Sabbath), but the Holy One, blessed be He, who knows His times and moments, began it (the seventh day) to a very hair’s breadth (with extreme exactness) and it therefore appeared as though He had completed His work on that very day (Genesis Rabbah 10:9). Another explanation: What did the world lack? Rest! Sabbath came — Rest came; and the work was thus finished and completed (Genesis Rabbah 10:9)!