Kabbalah Ulangan 15:1: Sha'arei Orah

Now that you are aware of this, know that wherever in Torah you find a count-Sefirah of seven, such as “seven years”¹⁹Deuteronomy 15:1 and elsewhere. or “seven times,”²⁰Leviticus 25:8 and elsewhere. it either refers to the secret of the Sefirot from Foundation-Yesod to Understanding-Binah or from Understanding-Binah to Foundation-Yesod. An example is the verse,²¹Exodus 31:17 “For six-Sheshet-ששת days did HaShem-יהו״ה make the heavens and the earth.” The verse specifies “six-Sheshet-ששת [days],” but does not say “in six-b’Sheshet-בששת [days].” Aside for those six (upper days), there are six mundane days (Chol-חול) that surround and encircle the quality of Foundation-Yesod, and are external to it, like external husks-Kelipot. They therefore are called the six mundane days (Chol-חול). In contrast, the six Sefirot from Understanding-Binah to the seventh, called Foundation-Yesod, are all holy (Kodesh-קודש) and not counted with the mundane (Chol-חול).