In previous studies we learned about the negative energy that can come from food. Here the Zohar reveals other major sources of negative energy. They cause the Shechinah to be removed from the world, and disconnect the person from the Light. His prayers can not be answered even with cries.
“ וְאִם שָׁכֹב יִשְׁכַּב אִישׁ אֹתָהּ, וּתְהִי נִדָּתָהּ עָלָיו”
“And if any man lies with her, her menstrual impurity comes upon him”
The most difficult sin is having sex with a woman during her Menstruation. A man who had sex with a woman in Menstruation connects himself to the most difficult impurity. His impurity affects the people who are close to him and the Shechinah is also moved away from them.
The menstrual cycle of a woman is important process of life in the world. The first part of the cycle is of growth, strength and life when a woman is capable of accepting seeds of life and grow a new ‘tree’, which is a human being with the aspect of ten Sefirot inside of her. If no tree is planted then the ‘fertile’ ground or vessel is broken, which is the aspect of death. This is an impure process and connecting to it brings death to anyone who came close to it.
A married couple should be very careful with their sexual unification. The woman should have a pure vessel. The spiritual law requires from a woman to check herself for 7 pure days before she meets with her husband. The 7 days requirement is to ensure that the woman had at least one Shabbat in purity, receiving the light of Binah. On the last pure day she does a Mikveh for complete purification and meets her husband on that night. The soul coming to such pure vessel would be on a higher level.