Likutei Moharan 56:12/ליקוטי מוהר"ן נ״ו:י״ב

112. And this is the explanation [of the opening verse]: {“On the day of the bikurim (first fruits), when you bring an offering of new grain to God as part of your Shavuot festival, you shall observe a mikra kodesh (holy occasion): you shall not do any mundane work.”} On the day of the bikurim—This is the aspect of malkhut, as it is written (Psalms 89:28), “I, too, will designate him My firstborn, the highest of the malkhei (kings) of the earth.”

2when you bring an offering of new grain to God—<That is, malkhut looks into the concealment within a concealment of those people under his rule and removes from there the sparks of holiness, which are transformed into Torah, as explained above. This is the meaning of “new… to God.” Initially, it was extremely concealed. But now that it has been revealed, it has become “new to God”—i.e., the Torah of God, the hidden Torah, as explained above.>

3as part of your Shavuot festival—This is the aspect of daat, the aspect of manna/the mikvah of Shavuot, which is the mikvah of the fiftieth gate <—i.e., the supernal daat has been revealed, as explained above>. Shavuot is therefore called ATZeRet, which has the same connotation as malkhut, as it is written (1 Samuel 9:17), “This one yaATZoR (will rule) My people.”

4you shall observe a mikra kodesh—This is the aspect of ruach hakodesh (Divine spirit), the aspect of the above mentioned ruach of the pulse. <In other words, the above mentioned sighs of holiness perfect the ruach of the pulse of the hands, which are the aspect of the heavens, so that he receives words of holiness from there. This is the aspect of ruach of holiness, as explained above.>

5you shall not do any mundane work—In order to eliminate the defilement of the serpent/thirty-nine labors/despair of the hands, as it is written (Genesis 5:29), “This one will bring us relief from our work and from the despair of our hands” <—i.e., a depressed ruach. May God protect us from the serpent’s ruach of depression. Amen.>