And this is the answer to the question of why specifically on Shabbat and in the Temple it is said, "I am the Lord"? This is because to be holy means to be distinct and separated, and this is not always easy, and when G-d sees that you are making an effort and sanctifying yourself by observing Shabbat, and in "my temples you will fear," that is, in your effort to sanctify yourself as a Jew in prayer in a minyan, in setting times for Torah study, in self-control in times of anger, God promises you, dear ones, 'I am the Lord...' – faithful to pay a good reward to those who walk before me (Rashi, Shemot 6:2). From Abba in Heaven, may God merit Amen! Shabbat Shalom and Blessed!!
You shall keep My Sabbath, and you shall fear My sanctuary, I am the Lord" (26:2 ) and Rashi: "I am the Lord: I am faithful to pay a reward." (And the sweetness of the light – Shabbat Kodesh)