Reshit Chokhmah
Also in the Tikkunei Zohar (56th Correction) it teaches about the immoral relations, and after it says: 13. And though it is said THAT all these types of nakedness DAMAGE the Sfirot, they do not the Name Yud Hei Vav Hei. FOR, HEAVEN FORBIDS, THAT ONE DAMAGES his place above IN ATZILUT, but when the Shechinah, MALCHUT, exiled, all the Sfirot came down with her INTO THE WORLDS BRIYAH, YETZIRAH AND ASIYAH. There is no division in her and between the ten Sfirot, and when they went down they were clothed in the six workdays, THE SECRET OF METATRON, WHICH ARE THE SIX END SFIROT OF YETZIRAH. 15. HE ASKS, and why is there division DURING WEEKDAYS? Because there is no Righteous, the sign of the covenant, YESOD, there. And the secret of this IS THE VERSE, “For there is not a righteous man upon earth” (Kohelet 7:20), who is the sign of the covenant, YESOD, there. MATING IS DONE THROUGH YESOD; WITHOUT IT THERE IS DIVISION. And on Shabbat, which is the seventh day, MALCHUT, there is the closeness and union of the Name Yud Hei Vav Hei and all the Sfirot, FOR THEN IS THE TIME OF MATING OF YESOD AND MALCHUT. Due to this, the time for marital duty for the scholars of the Torah is on Shabbat night. FOR THEN THERE IS MATING ABOVE, NOT DURING WEEKDAYS. BY THAT, THEY WILL HAVE WORTHY CHILDREN, AND ALSO THEY MEND THE SIN OF ADAM, WHO DAMAGED A SUPERNAL PLACE. 16. These sexual misconducts, WHICH ARE SAMAEL AND THE SERPENT, are surely below, IN THE WORLDS BRIYAH, YETZIRAH AND ASIYAH. But above, IN THE WORLD OF ATZILUT, it says, “nor shall evil dwell with you.” YET IN BRIYAH, YETZIRAH AND ASIYAH, THEY CAUSE DIVISION BETWEEN THE SFIROT. AND THEREFORE when a righteous approaches his wife on weekdays, it says of the child he begets, ‘a righteous man for whom it is bad,’ for he causes holiness, the seventh day, to be not holy. At that time, it says, ‘a righteous to whom it is bad, and an evil man to whom it is good.’ FOR EVEN THOUGH HE IS RIGHTEOUS AND HIS INTENTION IS TO FULFILL THE PRECEPT OF ‘BE FRUITFUL AND MULTIPLY,’ NEVERTHELESS HE CAUSES HOLINESS TO BE A WEEKDAY. FOR THAT DROP, WHICH IS THE SECRET OF THE SEVENTH DAY, WHICH IS HOLINESS, IS INJECTED DURING A WEEKDAY. THEREFORE IT IS BAD FOR HIM, THOUGH HE BE RIGHTEOUS. FOR DURING WEEKDAYS THE TREE OF KNOWLEDGE OF GOOD AND EVIL DOMINATES, AND THUS THE CHILD IS MIXED OF GOOD AND EVIL. 17. But above, IN ATZILUT, there is no nakedness and cutting and separation and severance.