Ha'azinu: Chapter 45
The formation of face to face of the Nukva of Zeir Anpin

We are told that after Malchut separated from the sides of Zeir Anpin, she joined Him face to face. When they are joined they seem like one body, and all the worlds are joyful as on Shabbat when everything is under the influence of a whole body. From this idea Rabbi Shimon deduces that whoever does not exist as male and female receives no blessings and cannot last. We learn that Malchut is considered a mother to all the lower beings of the three worlds. Rabbi Shimon speaks about the lower Chochmah and the supernal Chochmah.