The Holy One Blessed be He is Zeir Anpin, the son of YH יה, which is Chokmah and Binah. Zeir Anpin V ו with the ‘parents’, יה is YHV יהו. When the Shechina, Malchut, is elevated then there is unification of upper and lower. The name YHVH יהוה is in complete presence and the Light is revealed.
The word for sacrifice, offering is ‘קרבן’ that have the root of ‘קרב’, meaning coming closer.
Our spiritual work to bring the Shechina closer to Zeir Anpin has the aspect of offerings that complete the name YHVH and draw its presence in the world.
“זֹבֵחַ לָאֱלֹהִים יָחֳרָם בִּלְתִּי לַיהוָה לְבַדּוֹ”
“He who sacrifices to any god, other than to YHVH alone, shall be utterly destroyed.”
Other Gods are from the Left column of the other-side and represent the world of separation that has no unification.
“וַיַּרְא אֱלֹהִים אֶת הָאוֹר כִּי טוֹב וַיַּבְדֵּל אֱלֹהִים בֵּין הָאוֹר וּבֵין הַחֹשֶׁךְ”
“God saw that the light was good; and God separated the light from the darkness.”
Darkness was separated from the Light and submitting offerings to the dark-side bring judgments and destruction. The Zohar correcponds this as a connection to the impurity of a woman during her menstrual period.
“וְאֶל אִשָּׁה בְּנִדַּת טֻמְאָתָהּ לֹא תִקְרַב לְגַלּוֹת עֶרְוָתָהּ”
“’Also you shall not approach a woman to uncover her nakedness during her menstrual impurity.”
During the period, ‘darkness’, which is ‘death’ of the egg is the aspect of separation from the light, womb, vessel of light.
Getting closer to a woman in her period is forbidden because the process is of judgment and have negative effect on the soul of a man.
Friday night is the best time for a couple to have unification with purity because of the Binah and Zeir Anpin are in unification.