Sforno on Exodus 16:29/ספורנו על שמות ט״ז:כ״ט

1ראו!, “try and understand!”

2כי ה' נתן לכם השבת, the Sabbath regulations are not merely prohibitions, etc, but first and foremost the Sabbath is a gift from G’d to you, a gift for you exclusively, something G’d did not give to any other nation. The Talmud Shabbat 10 phrases it thus: “I have a precious gift in my treasure chamber, its name is “Sabbath.” I want to give it to the people of Israel.” Based on this concept of what the Sabbath is all about, the sages who formulated the Sabbath morning prayer, עמידה, emphasised that “You did not give it to the nations of the world, in fact they are not even allowed, being uncircumcised, to partake in the מנוחה, “the constructive rest, which is so characteristic of the Sabbath.” This is also echoed in Exodus 31,16 ושמרו בני ישרל את השבת לעשות את השבת לדוררותם. “The Children of Israel are to observe the Sabbath to constructively make of it the Sabbath throughout their generations.” The implication is that proper observance of the Sabbath, its concept, will ensure that we will be around throughout the generations, will partake in the redemption.