The Book of Zohar, Chapter “VaYakhel (And He Assembled),” Item 180: What is Saturday (Shabbat)? Why is it called Saturday? It is because when a point of desire rose and its light manifested, it was crowned with the forefathers, HGT of Zeir Anpin, in order to unite with them together….
Malchut with the forefathers together are called Shabbat (שבת). This word can be written as ש-בת (She–Bat). The three letters Vav (ו) that together comprise the letter Shin (ש) point to the three forefathers, HGT. And Malchut called “Bat” (daughter) is crowned with them.
“Shabbat” (The Sabbath) is the highest degree which corresponds to the end of the entire correction, the seventh millennium. Six millennia correspond to the six Sefirot of Zeir Anpin, the properties of which we have to receive in Malchut.
Malchut, by incorporating into herself the influence of these six properties of Zeir Anpin: Hesed, Gevurah, Tifferet, Netzah, Hod, Yesod become ready to receive the Light in uniting with Zeir Anpin. This is the unity of the Creator (Light) and the creature (Shechina, Malchut, desire).
Malchut collects all the souls, the desires undergoing correction, which exist in the broken, egoistic states in the worlds of BYA. Of course, until Malchut assumes all the properties of Zeir Anpin, she is not worthy of uniting with him. In all the properties that appear in her, she is obliged to take upon herself correspondence to Zeir Anpin.
Then, Malchut receives for the sake of bestowal, in correspondence to Zeir Anpin, in order to become similar to him. In so doing, she rises, clothes in him, and reaches the degree of She-Bat. Being a daughter (Bat), she nevertheless reaches the three upper lines: She, meaning the forefathers, HGT.
Similarly, we do not feel any benefit in correction until we come to its completion. Then all the corrections which we performed on ourselves in the course of six “days” or “millennia” get manifested, and “Saturday” or the “seventh millennium” becomes revealed.
From the 1st part of the Daily Kabbalah Lesson 2/6/2011, Writings of Rabash