אי זה זה שם טוב שקנתה שכל המועדים עתידין ליבטל וימי הפורים אינן בטלים לעולם, א"ר אלעזר אף יום הכפורים לא יבטל לעולם שנאמר והיתה זאת לכם לחקת עולם.
All of the holidays are destined to become obsolete, but Purim will be relevant forever...
(יח) כָּל סִפְרֵי הַנְּבִיאִים וְכָל הַכְּתוּבִים עֲתִידִין לִבָּטֵל לִימוֹת הַמָּשִׁיחַ חוּץ מִמְּגִלַּת אֶסְתֵּר וַהֲרֵי הִיא קַיֶּמֶת כַּחֲמִשָּׁה חֻמְּשֵׁי תּוֹרָה וְכַהֲלָכוֹת שֶׁל תּוֹרָה שֶׁבְּעַל פֶּה שֶׁאֵינָן בְּטֵלִין לְעוֹלָם. וְאַף עַל פִּי שֶׁכָּל זִכְרוֹן הַצָּרוֹת יְבֻטַּל שֶׁנֶּאֱמַר (ישעיה סה טז) "כִּי נִשְׁכְּחוּ הַצָּרוֹת הָרִאשׁוֹנוֹת וְכִי נִסְתְּרוּ מֵעֵינִי". יְמֵי הַפּוּרִים לֹא יִבָּטְלוּ שֶׁנֶּאֱמַר (אסתר ט כח) "וִימֵי הַפּוּרִים הָאֵלֶּה לֹא יַעַבְרוּ מִתּוֹךְ הַיְּהוּדִים וְזִכְרָם לֹא יָסוּף מִזַּרְעָם":
(18) All Prophetic Books and the Sacred Writings will cease [to be recited in public] during the messianic era except the Book of Esther. It will continue to exist just as the Five Books of the Torah and the laws of the Oral Torah that will never cease. Although ancient troubles will be remembered no longer, as it is written: "The troubles of the past are forgotten and hidden from my eyes" (Isaiah 65:16), the days of Purim will not be abolished, as it is written: "These days of Purim shall never be repealed among the Jews, and the memory of them shall never cease from their descendants" (Esther 9:28).
Rav Adda, son of Rabbi Ḥanina, said: Had Israel not sinned in earlier times they would have been given the five books of the Torah and the book of Joshua alone. They needed the book of Joshua because it includes the arrangement of Eretz Yisrael. Since it contains the division of Eretz Yisrael among the tribes, it was required for all generations, but the other books of the prophets primarily detail the history of how Israel angered God and He sent prophets to admonish them.
(יז) מוּטָב לָאָדָם לְהַרְבּוֹת בְּמַתְּנוֹת אֶבְיוֹנִים מִלְּהַרְבּוֹת בִּסְעֻדָּתוֹ וּבְשִׁלּוּחַ מָנוֹת לְרֵעָיו. שֶׁאֵין שָׁם שִׂמְחָה גְּדוֹלָה וּמְפֹאָרָה אֶלָּא לְשַׂמֵּחַ לֵב עֲנִיִּים וִיתוֹמִים וְאַלְמָנוֹת וְגֵרִים. שֶׁהַמְשַׂמֵּחַ לֵב הָאֻמְלָלִים הָאֵלּוּ דּוֹמֶה לַשְּׁכִינָה שֶׁנֶּאֱמַר (ישעיה נז טו) "לְהַחֲיוֹת רוּחַ שְׁפָלִים וּלְהַחֲיוֹת לֵב נִדְכָּאִים":
(17) One should rather spend more money on gifts to the poor than on his Purim banquet and presents to his friends. No joy is greater and more glorious than the joy of gladdening the hearts of the poor, the orphans, the widows, and the strangers. He who gladdens the heart of these unhappy people imitates God, as it is written: "I am … to revive the spirit of the humble, and to put heart into the crushed" (Isaiah 57:15).
אסתר מן התורה מנין (דברים לא, יח) ואנכי הסתר אסתיר מרדכי מן התורה מנין דכתיב (שמות ל, כג) מר דרור ומתרגמינן מירא דכיא:
They also asked Rav Mattana: From where in the Torah can one find an allusion to the events involving Esther? He replied to them that the verse states: “Then My anger shall be kindled against them on that day, and I will forsake them, and I will hide My face from them, and they shall be devoured, and many evils and troubles shall come upon them; so that they will say in that day: Have not these evils come upon us because our God is not among us? And I will hide [haster astir] My face on that day for all the evil which they shall have wrought, in that they are turned to other gods” (Deuteronomy 31:17–18).