רְאוּבֵן֙ בְּכֹ֣רִי אַ֔תָּה כֹּחִ֖י וְרֵאשִׁ֣ית אוֹנִ֑י יֶ֥תֶר שְׂאֵ֖ת וְיֶ֥תֶר עָֽז׃
Rubén, tú eres mi primogénito, mi fortaleza, y el principio de mi vigor; Principal en dignidad, principal en poder.
Tanya
At the time the First Temple stood, in which the Ark and Tables [of the Decalogue] were housed in the Holy of Holies, the Shechinah, i.e. Malchut d'Atzilut, that is, the aspect of the "revealed" light of the blessed En Sof, dwelled there and was clothed in the Ten Commandments, far higher and stronger, and with a greater and mightier revelation, than its revelation in the shrines of the Holy of Holies above in the upper worlds. For the Ten Commandments are the "All-embracing principles of the whole Torah," which comes from the Higher Wisdom, that is far higher than the world of manifestation. In order to engrave them on material tablets of stone it (the Shechinah) did not descend degree by degree, parallel to the order of descent of the worlds down to this material world. For this material world functions through the garment of material nature, while the Tables [of the Decalogue] are "The work of G‑d, and the writing is the writing of G‑d," beyond the nature of this material world which is derived from the effulgence of the Shechinah in the shrine of the Holy of Holies of Asiyah ("Action"), whence issues light and vitality to the world of Asiyah, in which this our world also is contained. But the category of the Higher Wisdom of Atzilut, consisting of the totality of the Torah as it is epitomized in the Decalogue, has clothed itself in Malchut of Atzilut and of Beriah alone, and they alone, united as they are with the light of the blessed En Sof that is within them, are referred to as the "Shechinah" which rested in the Holy of Holies of the First Temple, through its clothing itself in the Ten Commandments, which were engraved in the Tables [reposing] in the Ark, by miraculous means and by the work of the Living G‑d (this being the "hidden" world which nests in the world of Beriah as is known to those familiar with the Esoteric Discipline).