(טו) וּסְפַרְתֶּ֤ם לָכֶם֙ מִמָּחֳרַ֣ת הַשַּׁבָּ֔ת מִיּוֹם֙ הֲבִ֣יאֲכֶ֔ם אֶת־עֹ֖מֶר הַתְּנוּפָ֑ה שֶׁ֥בַע שַׁבָּת֖וֹת תְּמִימֹ֥ת תִּהְיֶֽינָה׃ (טז) עַ֣ד מִֽמָּחֳרַ֤ת הַשַּׁבָּת֙ הַשְּׁבִיעִ֔ת תִּסְפְּר֖וּ חֲמִשִּׁ֣ים י֑וֹם וְהִקְרַבְתֶּ֛ם מִנְחָ֥ה חֲדָשָׁ֖ה לַה'
(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: (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.
אמר רבא ותסברא אטו עצרת יומי מנינן שבועי לא מנינן והאמר אביי מצוה למימני יומי דכתיב (ויקרא כג, טז) תספרו חמשים יום ומצוה למימני שבועי דכתיב (דברים טז, ט) שבעה שבועות תספר לך ועוד חג שבועות כתיב
Is that to say that for Shavuot we count days but we do not count weeks? Didn’t Abaye say: It is a mitzva to count days, in the counting of the omer, as it is written: “Until the morrow of the seventh week, you shall count fifty days” (Leviticus 23:16); and it is also a mitzva to count weeks, as it is written: “Seven weeks you shall count for yourself, from when the sickle is first put to the standing corn” (Deuteronomy 16:9);and further, it is written: “The festival of weeks [shavuot]” (Deuteronomy 16:10), which indicates that it is a Festival that is established through a count of weeks?
(א) תְּפִלָּה֮ לְמֹשֶׁ֪ה אִֽישׁ־הָאֱלֹ֫קִ֥ים אֲֽדֹנָ֗י מָע֣וֹן אַ֭תָּה הָיִ֥יתָ לָּ֗נוּ בְּדֹ֣ר וָדֹֽר׃ (ב) בְּטֶ֤רֶם ׀ הָ֘רִ֤ים יֻלָּ֗דוּ וַתְּח֣וֹלֵֽל אֶ֣רֶץ וְתֵבֵ֑ל וּֽמֵעוֹלָ֥ם עַד־ע֝וֹלָ֗ם אַתָּ֥ה אֵֽל׃ (ג) תָּשֵׁ֣ב אֱ֭נוֹשׁ עַד־דַּכָּ֑א וַ֝תֹּ֗אמֶר שׁ֣וּבוּ בְנֵי־אָדָֽם׃ (ד) כִּ֤י אֶ֪לֶף שָׁנִ֡ים בְּֽעֵינֶ֗יךָ כְּי֣וֹם אֶ֭תְמוֹל כִּ֣י יַעֲבֹ֑ר וְאַשְׁמוּרָ֥ה בַלָּֽיְלָה׃ (ה) זְ֭רַמְתָּם שֵׁנָ֣ה יִהְי֑וּ בַּ֝בֹּ֗קֶר כֶּחָצִ֥יר יַחֲלֹֽף׃ (ו) בַּ֭בֹּקֶר יָצִ֣יץ וְחָלָ֑ף לָ֝עֶ֗רֶב יְמוֹלֵ֥ל וְיָבֵֽשׁ׃ (ז) כִּֽי־כָלִ֥ינוּ בְאַפֶּ֑ךָ וּֽבַחֲמָתְךָ֥ נִבְהָֽלְנוּ׃ (ח) שת [שַׁתָּ֣ה] עֲוֺנֹתֵ֣ינוּ לְנֶגְדֶּ֑ךָ עֲ֝לֻמֵ֗נוּ לִמְא֥וֹר פָּנֶֽיךָ׃ (ט) כִּ֣י כָל־יָ֭מֵינוּ פָּנ֣וּ בְעֶבְרָתֶ֑ךָ כִּלִּ֖ינוּ שָׁנֵ֣ינוּ כְמוֹ־הֶֽגֶה׃ (י) יְמֵֽי־שְׁנוֹתֵ֨ינוּ בָהֶ֥ם שִׁבְעִ֪ים שָׁנָ֡ה וְאִ֤ם בִּגְבוּרֹ֨ת ׀ שְׁמ֘וֹנִ֤ים שָׁנָ֗ה וְ֭רָהְבָּם עָמָ֣ל וָאָ֑וֶן כִּי־גָ֥ז חִ֝֗ישׁ וַנָּעֻֽפָה׃ (יא) מִֽי־י֭וֹדֵעַ עֹ֣ז אַפֶּ֑ךָ וּ֝כְיִרְאָתְךָ֗ עֶבְרָתֶֽךָ׃ (יב) לִמְנ֣וֹת יָ֭מֵינוּ כֵּ֣ן הוֹדַ֑ע וְ֝נָבִ֗א לְבַ֣ב חָכְמָֽה׃ (יג) שׁוּבָ֣ה ה' עַד־מָתָ֑י וְ֝הִנָּחֵ֗ם עַל־עֲבָדֶֽיךָ׃ (יד) שַׂבְּעֵ֣נוּ בַבֹּ֣קֶר חַסְדֶּ֑ךָ וּֽנְרַנְּנָ֥ה וְ֝נִשְׂמְחָ֗ה בְּכָל־יָמֵֽינוּ׃ (טו) שַׂ֭מְּחֵנוּ כִּימ֣וֹת עִנִּיתָ֑נוּ שְׁ֝נ֗וֹת רָאִ֥ינוּ רָעָֽה׃ (טז) יֵרָאֶ֣ה אֶל־עֲבָדֶ֣יךָ פָעֳלֶ֑ךָ וַ֝הֲדָרְךָ֗ עַל־בְּנֵיהֶֽם׃ (יז) וִיהִ֤י ׀ נֹ֤עַם אדושם אֱלֹקֵ֗ינוּ עָ֫לֵ֥ינוּ וּמַעֲשֵׂ֣ה יָ֭דֵינוּ כּוֹנְנָ֥ה עָלֵ֑ינוּ וּֽמַעֲשֵׂ֥ה יָ֝דֵ֗ינוּ כּוֹנְנֵֽהוּ׃
(1) A prayer of Moses, the man of God. O Lord, You have been our refuge in every generation. (2) Before the mountains came into being, before You brought forth the earth and the world, from eternity to eternity You are God. (3) You return man to dust; You decreed, “Return you mortals!” (4) For in Your sight a thousand years are like yesterday that has passed, like a watch of the night. (5) You engulf men in sleep; at daybreak they are like grass that renews itself; (6) at daybreak it flourishes anew; by dusk it withers and dries up. (7) So we are consumed by Your anger, terror-struck by Your fury. (8) You have set our iniquities before You, our hidden sins in the light of Your face. (9) All our days pass away in Your wrath; we spend our years like a sigh. (10) The span of our life is seventy years, or, given the strength, eighty years; but the best of them are trouble and sorrow. They pass by speedily, and we are in darkness. (11) Who can know Your furious anger? Your wrath matches the fear of You. (12) Teach us to count our days rightly, that we may obtain a wise heart. (13) Turn, O LORD! How long? Show mercy to Your servants. (14) Satisfy us at daybreak with Your steadfast love that we may sing for joy all our days. (15) Give us joy for as long as You have afflicted us, for the years we have suffered misfortune. (16) Let Your deeds be seen by Your servants, Your glory by their children. (17) May the favor of the Lord, our God, be upon us; let the work of our hands prosper, O prosper the work of our hands!
ר"ע אומר למד תורה בילדותו ילמוד תורה בזקנותו היו לו תלמידים בילדותו יהיו לו תלמידים בזקנותו שנא' בבקר זרע את זרעך וגו' אמרו שנים עשר אלף זוגים תלמידים היו לו לרבי עקיבא מגבת עד אנטיפרס וכולן מתו בפרק אחד מפני שלא נהגו כבוד זה לזה
Rabbi Akiva says that the verse should be understood as follows: If one studied Torah in his youth he should study more Torah in his old age; if he had students in his youth he should have additional students in his old age, as it is stated: “In the morning sow your seed, etc.” They said by way of example that Rabbi Akiva had twelve thousand pairs of students in an area of land that stretched from Gevat to Antipatris in Judea, and they all died in one period of time, because they did not treat each other with respect.