Genesis 2:2 says, “And God completed on the seventh day His work that He did, and He abstained on the seventh day from all His work that He did.” Rabbi Shimon argues in the Genesis Rabbati, “[A human being of] flesh and blood, who cannot [exactly] know his times and his moments, must add from the profane to the holy [i.e., he must add some time to the Sabbath.] The Holy One, blessed be He, Who knows His times and His moments [exactly], entered it [the Sabbath] within a hairbreadth, and it therefore appeared as if He completed it [His work] on that day. Another explanation: What was the world lacking? Rest. The Sabbath came, and so came rest. The work was completed and finished.”
Shabbat Shalom from all of us at the Jewish Virtual Library!