שֵׁ֣שֶׁת יָמִים֮ תֵּעָשֶׂ֣ה מְלָאכָה֒ וּבַיּ֣וֹם הַשְּׁבִיעִ֗י שַׁבַּ֤ת שַׁבָּתוֹן֙ מִקְרָא־קֹ֔דֶשׁ כָּל־מְלָאכָ֖ה לֹ֣א תַעֲשׂ֑וּ שַׁבָּ֥ת הִוא֙ לַֽיהוָ֔ה בְּכֹ֖ל מֽוֹשְׁבֹתֵיכֶֽם׃ (פ)
六日要做工，但第七日是完全安息的安息日，是聖會；任何工作你們都不可做。在你們一切的住處，這是歸給永恆者的安息日。
Tosefta Rosh Hashanah
Rabbi Yehuda says [in the name of] Rabbi Eliezer: "A Sabbath of complete rest" (Lev. 23:3) -- that is the Sanctification of the Day; "a reminder" (ibid.) -- that is the Remembrances; "trumpet blasts" (ibid.) -- that is the Shofrot; "a holy convocation" -- that means to sanctify it [by abstaining from work]. Said to him Rabbi Akiva, for what reason does the verse not say, a "Shabbaton of rest"? Because it already mentions "rest"*i.e., the root word for "rest" is already contained in "Shabbaton" and need not be midrashically derived. Rather, "a reminder" -- that is Remembrances; "trumpet blasts" -- that is Shofrot; "a holy convocation" -- that is the Sanctification of the Day.