שלח

This is related to the Partzuf (spiritual configuration) of the Nukva (female aspect), which unites with them, and they are Leah and Rachel. These Partzufim (plural of Partzuf) are positioned behind Ze'ir Anpin (Z"A, Small Face), with Leah standing opposite the chest of Z"A, and the Chesed (kindness) behind the Da'at (knowledge) of Z"A at the place of the knot of the Tefillin. This is because the Chesed in Z"A at this place is covered and concealed by the garment of the Yesod (foundation) of Imma (mother). Therefore, Leah is considered the aspect of "Alma Deitkasya" (the concealed world), as she stands opposite the place where Chesed is covered.

In contrast, Rachel stands from the chest of Z"A and below, where the Chesed in Z"A at this place is no longer concealed and is dressed within the Yesod of Imma. From there and onward, the Chesed is already revealed without a garment. Therefore, Rachel, who stands in this place, is considered the aspect of "Alma Deitgalya" (the revealed world).

The hair of the head, known as "Kutzin" (hairs), emerges from the Mochin (intellects) of Ibur (gestation), and they extend initially to the chest of Z"A, reaching the head of Nukva, which is called Rachel. These hairs, which began to grow initially due to the Mochin of Ibur, continue to grow even afterward. Despite being pushed down to the body of Z"A, the Or (light) still returns upward, and therefore, their growth period is longer than others, extending to the chest of Z"A and behind it.

Later, during the time of the Yika (growth), other hairs grow between these Kutzin, extending to the throat of Z"A, reaching the head of the right side, but they are shorter. These are called the hairs of Leah. Refer to the introduction of the Idra Rabba for further explanation.

Afterward, other hairs grow between them from the Mochin of Gadlut (maturity), which are even shorter, extending only from the skull to the head of Z"A itself, and not beyond. These are for the benefit of Z"A alone and not for others.

Thus, there are three types of returning light that break through the head of Z"A and emerge in the form of three types of Kutzin hairs. These extend to the back of the chest of Z"A, reaching the head of Rachel, and the hairs of the right side extend to the nape of Z"A, the place where Leah stands. These hairs illuminate upwards in their place and benefit only Z"A itself.