Reference for Leviticus 23:31

כָּל־מְלָאכָ֖ה לֹ֣א תַעֲשׂ֑וּ חֻקַּ֤ת עוֹלָם֙ לְדֹרֹ֣תֵיכֶ֔ם בְּכֹ֖ל מֹֽשְׁבֹֽתֵיכֶֽם׃

Ye shall do no manner of work; it is a statute for ever throughout your generations in all your dwellings.