Right Place Right Time Parshat Behar / Yom Yerushalayim

Or Hachaim

את שבתתי תשמורו, "Observe My Sabbaths!" Why did the Torah again repeat the commandment to observe the Sabbath? I believe the Torah wanted to write the commandment of Sabbath-observance next to the commandment preceding it not to make anything resembling idolatrous symbols. This is the Torah's way of reminding us that just as idolatry or rather abstaining from it is equivalent to observing the entire Torah, so Sabbath-observance is also equivalent to observance of the whole Torah.

English Ibn Ezra Vayikra 26:1

The injunction to observe My sabbaths also includes the Sabbatical years;

while revere My sanctuary also denotes the jubilee year, as it is written, "it will be sanctified by you" [25:12].

English Ibn Ezra Vayikra 26:1
In my opinion, "observe my sabbaths" is mentioned on account of having mentioned "to prostrate yourselves upon it" [:1], along the lines of "every Sabbath, all flesh shall come to bow to the ground before me" [Isaiah 66:23]. In other words: You must come every Sabbath to prostrate yourselves before Me — not on some ornamental stone, but only in My sanctuary. Thus, Scripture mentions the choice day (which was chosen for the service of God, as I have explained [comment on Genesis 2:3]), as well as the choice place.

Daat Zekeinim

את שבתותי תשמורו ומקדשי תיראו, “You shall keep My Sabbaths, and revere My Sanctuary.” The Torah draws a clear parallel between the Temple and the Sabbath. It tells us that just as the observance of the Sabbath as a holy day is a permanent commandment the reverence for the Temple is similarly a commandment that has no time limit. [The temple site is sacred ground even when the temple is not standing. Ed.] This is the meaning of אות היא לעולם, “it is a sign forever.” (Exodus 31,17.)

Just as a dove - even if you take her young birds from beneath her, she never leaves her dovecote, so too, the people of Israel, even though the Holy Temple was destroyed, they did not eliminate the the thrice yearly festival.

Just as a drawing even though it is erased, its impression on its original place is still recognizable, so to, even though the Holy Temple was destroyed, the people of Israel did not abolish the practice of going up to Jerusalem for the pilgrimage seasons thrice yearly.