Shavuot, A Quasi-Rosh Hashana
(טו) וּסְפַרְתֶּ֤ם לָכֶם֙ מִמָּחֳרַ֣ת הַשַּׁבָּ֔ת מִיּוֹם֙ הֲבִ֣יאֲכֶ֔ם אֶת־עֹ֖מֶר הַתְּנוּפָ֑ה שֶׁ֥בַע שַׁבָּת֖וֹת תְּמִימֹ֥ת תִּהְיֶֽינָה׃
(15) And from the day on which you bring the sheaf of elevation offering—the day after the sabbath—you shall count off seven weeks. They must be complete:

(טז) עַ֣ד מִֽמָּחֳרַ֤ת הַשַּׁבָּת֙ הַשְּׁבִיעִ֔ת תִּסְפְּר֖וּ חֲמִשִּׁ֣ים י֑וֹם וְהִקְרַבְתֶּ֛ם מִנְחָ֥ה חֲדָשָׁ֖ה לַיהוָֽה׃

(16) you must count until the day after the seventh week—fifty days; then you shall bring an offering of new grain to the LORD.

(טז) וַיְהִי֩ בַיּ֨וֹם הַשְּׁלִישִׁ֜י בִּֽהְיֹ֣ת הַבֹּ֗קֶר וַיְהִי֩ קֹלֹ֨ת וּבְרָקִ֜ים וְעָנָ֤ן כָּבֵד֙ עַל־הָהָ֔ר וְקֹ֥ל שֹׁפָ֖ר חָזָ֣ק מְאֹ֑ד וַיֶּחֱרַ֥ד כָּל־הָעָ֖ם אֲשֶׁ֥ר בַּֽמַּחֲנֶֽה׃

(16) On the third day, as morning dawned, there was thunder, and lightning, and a dense cloud upon the mountain, and a very loud blast of the horn; and all the people who were in the camp trembled.

What is going on in these Pesukim?

(ד) אַף עַל פִּי שֶׁתְּקִיעַת שׁוֹפָר בְּרֹאשׁ הַשָּׁנָה גְּזֵרַת הַכָּתוּב רֶמֶז יֵשׁ בּוֹ כְּלוֹמַר עוּרוּ יְשֵׁנִים מִשְּׁנַתְכֶם וְנִרְדָּמִים הָקִיצוּ מִתַּרְדֵּמַתְכֶם וְחַפְּשׂוּ בְּמַעֲשֵׂיכֶם וְחִזְרוּ בִּתְשׁוּבָה וְזִכְרוּ בּוֹרַאֲכֶם.

(4) Notwithstanding that the blowing of the ram's horn trumpet on Rosh ha-Shanah is a Scriptural statute, its blast is symbolic, as if saying: "Ye that sleep, bestir yourselves from your sleep, and ye slumbering, emerge from your slumber, examine your conduct, turn in repentance, and remember your Creater!

(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.

(א) וּבַחֹ֨דֶשׁ הַשְּׁבִיעִ֜י בְּאֶחָ֣ד לַחֹ֗דֶשׁ מִֽקְרָא־קֹ֙דֶשׁ֙ יִהְיֶ֣ה לָכֶ֔ם כָּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֣א תַעֲשׂ֑וּ י֥וֹם תְּרוּעָ֖ה יִהְיֶ֥ה לָכֶֽם׃

(1) In the seventh month, on the first day of the month, you shall observe a sacred occasion: you shall not work at your occupations. You shall observe it as a day when the horn is sounded.

(לה) בַּיּוֹם֙ הַשְּׁמִינִ֔י עֲצֶ֖רֶת תִּהְיֶ֣ה לָכֶ֑ם כָּל־מְלֶ֥אכֶת עֲבֹדָ֖ה לֹ֥א תַעֲשֽׂוּ׃

(35) On the eighth day it shall be an "atzeres" for you; you shall not work at your occupations.

(ח) שֵׁ֥שֶׁת יָמִ֖ים תֹּאכַ֣ל מַצּ֑וֹת וּבַיּ֣וֹם הַשְּׁבִיעִ֗י עֲצֶ֙רֶת֙ לַיהוָ֣ה אֱלֹהֶ֔יךָ לֹ֥א תַעֲשֶׂ֖ה מְלָאכָֽה׃ (ס)

(8) After eating unleavened bread six days, it shall be an "atzeres" for the LORD your God on the seventh day: you shall do no work.

(יג) יג וְכֵן נ"א וְכַאן שְׁנֵי כְתוּבִים הַמַּכְחִישִׁים זֶה אֶת זֶה. עַד שֶׁיָּבוא הַכָּתוּב הַשְּׁלִישִׁי וְיַכְרִיעַ בֵּינֵיהֶם:

If there are two pesukim that contradict, you can only learn out the Halacha if you have a third pasuk.

אמר רבי יוחנן ושניהם מקרא אחד דרשו כתוב אחד אומר (דברים טז, ח) עצרת לה' אלהיך וכתוב אחד אומר (במדבר כט, לה) עצרת תהיה לכם הא כיצד רבי אליעזר סבר או כולו לה' או כולו לכם ורבי יהושע סבר חלקהו חציו לה' וחציו לכם

Rabbi Yoḥanan said: And both of them derived from one verse, . One verse states: “It shall be a solemn assembly for the Lord, your God” (Deuteronomy 16:8), indicating a Festival dedicated to the service of God, and one verse states: “It shall be a solemn assembly for you” (Numbers 29:35), indicating a celebratory assembly for the Jewish people. How is this to be reconciled? Rabbi Eliezer holds that the two verses should be understood as offering a choice: The day is to be either entirely for God, in accordance with the one verse, or entirely for you, as per the other verse; and Rabbi Yehoshua holds that it is possible to fulfill both verses: Split the day into two, half of it for God and half of it for you.