וְאַתָּ֞ה דַּבֵּ֨ר אֶל־בְּנֵ֤י יִשְׂרָאֵל֙ לֵאמֹ֔ר אַ֥ךְ אֶת־שַׁבְּתֹתַ֖י תִּשְׁמֹ֑רוּ כִּי֩ א֨וֹת הִ֜וא בֵּינִ֤י וּבֵֽינֵיכֶם֙ לְדֹרֹ֣תֵיכֶ֔ם לָדַ֕עַת כִּ֛י אֲנִ֥י יְהוָ֖ה מְקַדִּשְׁכֶֽם׃
"Ty téż powiesz synom Israela tak: Wszakże Sabbatów Moich przestrzegajcie; bo to znak między Mną a wami, w pokoleniach waszych, byście poznali, żem Ja Wiekuisty, który poświęcam was.
Rashi
ואתה דבר אל בני ישראל SPEAK THOU ALSO UNTO THE CHILDREN OF ISRAEL — AND thou, although I have given thee charge to command them concerning the work of the Tabernacle let it not appear a light thing to thee to set the Sabbath aside on account of that work.
Alshekh
... [Shabbat observance] is an inner thing that connects between Me and you, as it is something that is within Me and goes into you, meaning in[to] your souls - such that your souls become like a sanctuary for My Divine Presence, which is also a part of God, may He be blessed... And if so, since the dwelling of the Divine Presence in the Tabernacle is not intrinsic, but rather a result of man - as it is found (Exodus 25:8), "'And make Me a sanctuary, so I will dwell among you,' 'so among it,' is not stated, but rather, 'so among them'"; which is because the sanctuary of God is man, and it spreads out from him to the Tabernacle - if so, I will ask from this, how is it that man who is the sanctuary of God would do work on Shabbat upon the Tabernacle which does not intrinsically have the Divine Presence within it, but rather from that which is drawn to it from man; as it is drawn to the Tabernacle from man, in his being the sanctuary of God.
Alshekh
And there is also a second reason; and that is that the Shabbat [represents] eternal holiness for man, whereas the Tabernacle is only for its time. So how could the holiness that is only for [all] generations be overridden by that which is only for a limited time. And this is [the meaning] of that which is written, "for your generations."