(כד) דַּבֵּ֛ר אֶל־בְּנֵ֥י יִשְׂרָאֵ֖ל לֵאמֹ֑ר בַּחֹ֨דֶשׁ הַשְּׁבִיעִ֜י בְּאֶחָ֣ד לַחֹ֗דֶשׁ יִהְיֶ֤ה לָכֶם֙ שַׁבָּת֔וֹן זִכְר֥וֹן תְּרוּעָ֖ה מִקְרָא־קֹֽדֶשׁ׃
(24) Speak to the Israelite people thus: In the seventh month, on the first day of the month, you shall observe complete rest, a sacred occasion commemorated with loud blasts.
The above verse uses the word Shabbat to refer to Rosh HaShana
(לב) שַׁבַּ֨ת שַׁבָּת֥וֹן הוּא֙ לָכֶ֔ם וְעִנִּיתֶ֖ם אֶת־נַפְשֹׁתֵיכֶ֑ם בְּתִשְׁעָ֤ה לַחֹ֙דֶשׁ֙ בָּעֶ֔רֶב מֵעֶ֣רֶב עַד־עֶ֔רֶב תִּשְׁבְּת֖וּ שַׁבַּתְּכֶֽם׃ (פ)
(32) It shall be a sabbath of complete rest for you, and you shall practice self-denial; on the ninth day of the month at evening, from evening to evening, you shall observe this your sabbath.
The above verse uses the word Shabbat to refer to Yom Kippur
(לט) אַ֡ךְ בַּחֲמִשָּׁה֩ עָשָׂ֨ר י֜וֹם לַחֹ֣דֶשׁ הַשְּׁבִיעִ֗י בְּאָסְפְּכֶם֙ אֶת־תְּבוּאַ֣ת הָאָ֔רֶץ תָּחֹ֥גּוּ אֶת־חַג־יְהוָ֖ה שִׁבְעַ֣ת יָמִ֑ים בַּיּ֤וֹם הָֽרִאשׁוֹן֙ שַׁבָּת֔וֹן וּבַיּ֥וֹם הַשְּׁמִינִ֖י שַׁבָּתֽוֹן׃
(39) Mark, on the fifteenth day of the seventh month, when you have gathered in the yield of your land, you shall observe the festival of the LORD [to last] seven days: a complete rest on the first day, and a complete rest on the eighth day.
The above verse uses the word Shabbat to refer to the first and last day of Sukkot