A small detail in (Exodus 16:1) caught the attention of the rabbis of the Mekhilta DeRabbi Yishmael. The verse states that the Israelites journeyed from Eilim and arrived in the Wilderness of Sin "on the fifteenth day of the second month" after leaving Egypt. Why does Scripture specify the exact day?
The answer, according to the Mekhilta, reveals something astonishing about the Sabbath. That fifteenth day was a Shabbat, and by mentioning the date, the Torah hints that this particular Shabbat was not an ordinary one. It was the continuation of an unbroken chain stretching all the way back to the six days of creation.
God rested on the seventh day after making the world (Genesis 2:2-3), and from that primordial rest, the Sabbath recurred every seven days without interruption. Through the long centuries before Abraham, through the patriarchs, through the bondage in Egypt, the Sabbath kept cycling. But it was not formally given to Israel until this moment in the wilderness.
The Torah marks this date to show the Sabbath bridging two eras. It had existed as a cosmic rhythm since creation, embedded in the structure of time itself. Now, at last, it was being handed to a people who would observe it consciously. The Shabbat that the Israelites encountered in the Wilderness of Sin was both ancient beyond measure and startlingly new, the same rest God had inaugurated at the dawn of the world, now entrusted to human hands for the first time.