Likutei Moharan 38:8/ליקוטי מוהר"ן ל״ח:ח׳

18. This is the explanation of “If you TaShiV (restrain) your foot on Shabbat, refrain from pursuing your affairs on My holy day” (Isaiah 58:13).

2ShaBbat is an aspect of BuShah.

3your ReGeL (foot) — Initially, he has to rectify the spoken word, which is called ReGeL. And how does one rectify speech?

4pursuing your affairs on My holy day — For the Serpent’s pollution brought about thirty-nine curses, the thirty-nine works. Thus, every person has to draw Shabbat’s holiness in order to sanctify the days of the week. As we find in the Mekhilta: “Remember the Shabbat day” (Exodus 20:8) —remember it from the first day of the week (Mekhilta, Yitro 7). And to the same degree that he sanctifies the weekdays, he dispels the Serpent’s pollution/an end to all flesh/the storm wind. Through this, the spoken word ascends. This is the explanation of:

5pursuing your affairs — When you engage in your affairs, i.e., on the weekdays.

6on My holy day — it should seem as though this is “My holy day.” You should draw from Shabbat’s holiness to the days of the week and so sanctify them from the thirty-nine works.