Shabbat liturgy
(1) And the heaven and the earth were finished, and all the host of them. (2) And on the seventh day God finished God's work which God had made; and God rested on the seventh day from all God's work which God had made. (3) And God blessed the seventh day, and hallowed it; because that in it God rested from all God's work which God in creating had made. (4) Such is the story of the heaven and of the earth when they were created, in the day that ADONAI God made earth and heaven.
(16) The People Israel shall keep the sabbath, to observe the sabbath throughout their generations, as a covenant for all time. (17) It shall be a sign for all time between Me and the People Israel for ever; for in six days ADONAI made heaven and earth, and on the seventh day God ceased from work and was refreshed.’
Commanded in two different ways
(ח) זָכוֹר אֶת יוֹם הַשַּׁבָּת לְקַדְּשׁוֹ. (ט) שֵׁשֶׁת יָמִים תַּעֲבֹד וְעָשִׂיתָ כָּל מְלַאכְתֶּךָ. (י) וְיוֹם הַשְּׁבִיעִי שַׁבָּת לַיהוָה אֱלֹהֶיךָ לֹא תַעֲשֶׂה כָל מְלָאכָה אַתָּה וּבִנְךָ וּבִתֶּךָ עַבְדְּךָ וַאֲמָתְךָ וּבְהֶמְתֶּךָ וְגֵרְךָ אֲשֶׁר בִּשְׁעָרֶיךָ. (יא) כִּי שֵׁשֶׁת יָמִים עָשָׂה יְהוָה אֶת הַשָּׁמַיִם וְאֶת הָאָרֶץ אֶת הַיָּם וְאֶת כָּל אֲשֶׁר בָּם וַיָּנַח בַּיּוֹם הַשְּׁבִיעִי עַל כֵּן בֵּרַךְ יְהוָה אֶת יוֹם הַשַּׁבָּת וַיְקַדְּשֵׁהוּ.
(8) Remember the sabbath day, to keep it holy. (9) Six days shall you labor, and do all of your work; (10) but the seventh day is a sabbath of Adonai your God: you shall not do any manner of work-- you, your son or daughter, your male or female servant, or your cattle, or the stranger who is within your settlements; (11) for in six days ADONAI made heaven and earth, the sea, and all that is in them, and rested on the seventh day; therefore ADONAI blessed the sabbath day, and hallowed it.
How do we acknowledge Shabbat?
Four things were said about Shabbat – two originate from the Torah, and two originate from the words of the Sages and are explicated by the prophets. From the Torah: "Zachor" ["Remember" Shabbat] and "Shamor" ["Observe" Shabbat]. Explicated by the prophets: kavod [displaying honor] and oneg [enjoying oneself], as it says, "and you shall call Shabbat "[a day of] delight," and the sacred [day] of the Lord, "a respected [day]."...
Modern Thought
The Sabbath Rabbi Abraham Joshua Heschel p.8, 10
Judaism teaches us to be attached to holiness in time, to be attached to sacred events, to learn how to consecrate sanctuaries that emerge from the magnificent stream of a year. The Sabbaths are our great cathedrals; and our Holy of Holies is a shrine that neither the Romans nor the Germans were able to burn; a shrine that even apostasy cannot easily obliterate...
Jewish ritual may be characterized as the art of significant forms in time, as architecture of time. Most of its observances--the Sabbath, the New Moon, the festivals, the Sabbatical and the Jubilee year--depend on a certain hour of the day or season of the year. It is, for example, the evening, morning, or afternoon that brings with it the call to prayer. The main themes of faith lie in the realm of time. We remember the day of the exodus from Egypt, the day when Israel stood at Sinai; and our Messianic hope is the expectation of a day, of the end of days...(p 8)
The meaning of the Sabbath is to celebrate time rather than space. Six days a week we live under the tyranny of things of space; on the Sabbath we try to become attuned to holiness in time. It is a day on which we are called upon to share in what is eternal in time, to turn from the results of creation to the mystery of creation, from the world of creation to the creation of the world...(p.10)
"Thinking Shabbat" Rabbi Lawrence Kusher in A Shabbat Reader p. 201
We need a way to describe liberal Jews who are serious about Shabbat. Shomer Shabbat, Keeper of Shabbat, based as it is on the language of the actual commandment in Deuteronomy, could be ideal. Unfortunately it has been appropriated and defined, meticulously and oppressively, by someone else. So we return to the text of the Fourth Commandment and realize that it is said twice, once in Deuteronomy and again in Exodus. In Deuteronomy (5:11) we are told "Shamor," keep the Sabbath. But in Exodus (2;7) the verb is different: we are told "Zachor," remember the Sabbath. Perhaps it is for us to create a new standard of Shabbat behavior called "Zachor Shabbat." One who is "Zocher Shabbat" would remember throughout the day's duration that it was Shabbat. (Not so easy as it first sounds.) We say to one another, Do anything you want--as long as you will remember that it is Shabbat, amd that will insure that whatever you do will be lichvod ha-Shabbat, for the honor of the Shabbat.