Holy Zohar text. Daily Zohar -53.

On Shabbat Malchut is going up to Binah to renew the connection and draw the energy like at the time of creation.
The Shabbat is called Holy because of the automatic connection to the supernal level. When we act like the other six days, meaning creating new forms, then it create drainage of the energy to lower levels.
This situation create spiritual “death”, which is loss of light and that brings us to the original state of (Genesis 1:2) “…unformed and void”

מקור הקטע: הקדמת תיקוני הזוהר עם פרוש מעלות הסולם (רבי יהודה צבי ברנדויין זל) פסקה 258