Kabbalah Yesaya 56:7: Sha'arei Orah

Know and have faith that whoever only has marital relations from the night of Shabbat to the night of Shabbat, merits having righteous children who merit the life of the coming world (Olam HaBa). This is because Shabbat is the quality of the Righteous-Tzaddik-צדיק, being that it is the matter of the Living God-El Chai-א"ל חי. About such a person it states,⁸⁸Psalms 1:3 “That yields its fruit in its appropriate time.” The prophet therefore said,⁸⁹Isaiah 56:4-5 “For thus says HaShem-יהו"ה to the barren who keep My Shabbats, who have chosen what I desire and uphold My covenant. I will give them honor and renown in My house and within My walls etc.” Now, are those who are barren the best of Israel? Do only the barren keep Shabbat? However, the explanation is that this verse refers to those righteous ones-Tzaddikim-צדיקים who make themselves as if they are barren, by refraining from marital relations during the six days of the week and only have marital relations on Shabbat nights. This is because the term “who keep” refers to the woman, as it says,⁹⁰Judges 13:13 “The angel of HaShem-יהו"ה said to Manoach, ‘Keep yourself from everything that I said to the woman.” The sign for this is “Remember-Zachor-זכור” for daytime and “Keep-Shamor-שמור” for nighttime. When they do this, what is written?⁹¹Isaiah 56:7 “I will bring them to My holy mountain and will gladden them in My house of prayer.” My holy mountain is the matter of the Living God-El Chai-א"ל חי and My house of prayer is the matter of HaShem’s-יהו"ה Lordship-Adona”y-אדנ"י, as these terms literally testify to two qualities – Remember-Zachor-זכור and Keep-Shamor-שמור. However, if heaven forbid, a person profanes the Shabbat, it is as if he denies the essential truth of HaShem-יהו"ה, being that Shabbat is the essence of the tree from below to above.