בַּיּ֥וֹם הָרִאשׁ֖וֹן מִקְרָא־קֹ֑דֶשׁ כָּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃
On the first day shall be a holy convocation; ye shall do no manner of servile work.
Read kabbalistic (mystical) interpretation of Leviticus 23:35: and classical mystical sources.