The Torah is included from the written Torah and the Oral Torah. The written part is the aspect of YHVH, Zeir Anpin and the Oral Torah is the aspect of ELHYM, Malchut. For that reason, the Torah is the secret of the Holy Name.
The written Torah is considered to have everything in it. The Oral Torah is the details or the specifics of the written Torah. The ‘whole’ needs to have the ‘details’ and the ‘details’ need to have the ‘whole’. Together they can reach completion.
The Torah is Zeir Anpin, that includes everything in the spiritual levels and the ‘details’, the Oral Torah, is Malchut that reveals the secrets of the ‘whole’ in details that is the study of the precepts of the Torah in the world of Action below.
“אַתָּה הָרְאֵתָ לָדַעַת כִּי יְהוָה הוּא הָאֱלֹהִים אֵין עוֹד מִלְבַדּוֹ.”
“To you, it was shown for us to know that YHVH, He is God; there is no other besides Him.”
We recite this verse in the synagogue before we open the ark and bring out the Torah for reading. This verse testifies to the unification of the written and oral Torah that leads us to the understanding that ‘there is no other God besides Him’.
The precepts of the Torah have the aspect of ‘details’ in the Oral Torah. The Zohar tells us that ‘Remember’ and ‘Observe’ in the following verses reveal that secret.
“זָכוֹר אֶת יוֹם הַשַּׁבָּת לְקַדְּשׁוֹ.”
“Remember the sabbath day, to keep it holy.”
“שָׁמוֹר אֶת יוֹם הַשַּׁבָּת לְקַדְּשׁוֹ כַּאֲשֶׁר צִוְּךָ יְהוָה אֱלֹהֶיךָ.”
“Observe the sabbath day to keep it holy, as YHVH your God commanded you.”
‘Remember’,’ זָכוֹר’ is the aspect of YHVH, the ‘Whole’ and ‘ שָׁמוֹר ‘ ‘Observe’ is ELHYM. The 613 precepts of the Torah are included in the secret of ‘Remember’ for the aspect of the 248 positive precepts of “You shall do…”. ‘Observe’ includes the 365 precepts of “You shall not do…”. Together (the ‘details’) they are the ‘whole’.
‘Remember’,’ זָכוֹר’ has the root ‘זכר’ that means ‘male’, implies a ‘channel’ of Light. This word is used in the first Ten Commandments in the portion of Yitro.
‘Observer’ ‘שָׁמוֹר’ is from the Ten Commandments described in the portion of Vaetchanan that is in the last book of the Torah, Deuteronomy and represents the aspect of Malchut, vessel.
The Light is the ‘whole’ and the ‘details’ is an aspect of actions in Malchut.
Shabbat is Malchut where we have the highest level of unification between light and vessel.
In the song ‘Lecha Dodi’ that we sing during Kabbalat Shabbat, we ‘remember’ זכור ושמור בדיבור אחד’, ‘Remember and Observe in one saying…’.