The Book of Zohar. Chapter “The Seventh Commandment” (abridged)
223. The Seventh Commandment is to perform circumcision (of desires that cannot be corrected) on the eighth day, and thus remove the impurity (of egoism) of the foreskin (Malchut), for Malchut (the desire that cannot be corrected within the 6000 years, in the process of correction) constitutes the eighth degree of all the degrees, beginning with Bina (Bina, Hesed, Gevura, Tifferet, Netzah, Hod, Yesod, Malchut). And the soul that soars from her (that ascends from Malchut Ohr Hozer ) must appear before her on the eighth day; hence, she constitutes the eighth degree.
224. It then becomes clear that the type (level) of this soul is Haya. That is, belonging to that holy degree of Haya (Malchut), and not to any other degree. And this is implied by, LET THE WATERS SWARM, as is explained in the book of Hanoch, the waters of the holy seed merge in the properties of the soul of Haya. And it is the property of the letter Yod (the level of Haya), marked on the sacred flesh, more than any other mark that exists in the world. (The level of Haya is the animate level; hence it is written, “Let the waters swarm” – Bina will be filled with parts of Malchut, which will thereby correct themselves by ascending and connecting Malchut to Bina).
225. The verse, LET BIRDS SOAR OVER THE EARTH, refers to Eliyahu (the prophet), who flies across the whole world in four flights (Yod–Hey–Vav–Hey) in order to be present in the place where the Holy Covenant (union of Malchut and Bina) is made. And a chair (the place of union between Malchut and Bina) must be prepared for him, and it must be said out loud (this must be revealed by means of correction), THIS IS THE CHAIR OF ELIYAHU. For if this is not done, he will not appear in that place (for want of an opportunity to reveal himself).
226. And the Creator created great Leviathans (Malchut in its completely corrected state). They were two: (called) Orla and Preia, male (Masach and Ohr Hozer) and female (desire, Aviut) forces. And (He also created) all living creatures (of the level of Haya). This is the mark (revelation) of the Holy Covenant (between the Creator and Malchut), the soul of the holy Light of Haya (Ohr Hozer of the level of Haya), as it is written, “LET THE WATERS (of Bina, and Malchut that connected to her) SWARM,” i.e. the Supernal Waters (the forces of Bina) that descend to this Covenant (with Malchut).
227. The reason why Israel (the correcting part) below (in Malchut) is marked in the holy form (love and bestowal), similar to its form Above (in Bina), is to separate the pure part (Malchut that becomes corrected by uniting with Bina) from the impure (one that cannot be corrected until Gmar Tikkun), to distinguish between the holiness of Israel (that which can be corrected, what remains after circumcision) and the other nations (which cannot be corrected until the end of correction, which are cut off) that originate from the other (egoistic) side. And just as Israel (parts of Malchut that can be corrected) was marked, so were the animals and birds (levels of Malchut) to determine which of them belong to Israel (which need to be corrected), and which belong to the nations of the world (which are to be corrected later). (Israel = Isra–El = straight to the Creator – meaning the parts of Malchut that can be corrected. This bears no relation to nationality, but only to one’s desire, one’s point in the heart. This happened for the first time in Babylon, when a group of people with point in the heart – the desire for correction, separated from the rest of the Babylonians).
“Introduction to the Book of Zohar.” Items 13-18