Achashverosh Miscalculation
(ג) בִּשְׁנַ֤ת שָׁלוֹשׁ֙ לְמׇלְכ֔וֹ עָשָׂ֣ה מִשְׁתֶּ֔ה לְכׇל־שָׂרָ֖יו וַעֲבָדָ֑יו חֵ֣יל ׀ פָּרַ֣ס וּמָדַ֗י הַֽפַּרְתְּמִ֛ים וְשָׂרֵ֥י הַמְּדִינ֖וֹת לְפָנָֽיו׃

(3) in the third year of his reign, he gave a banquet for all the officials and courtiers—the administration of Persia and Media, the nobles and the governors of the provinces in his service.

Why did Achashverosh make this party?

(יא) וְהָֽיְתָה֙ כׇּל־הָאָ֣רֶץ הַזֹּ֔את לְחׇרְבָּ֖ה לְשַׁמָּ֑ה וְעָ֨בְד֜וּ הַגּוֹיִ֥ם הָאֵ֛לֶּה אֶת־מֶ֥לֶךְ בָּבֶ֖ל שִׁבְעִ֥ים שָׁנָֽה׃ (יב) וְהָיָ֣ה כִמְלֹ֣אות שִׁבְעִ֣ים שָׁנָ֡ה אֶפְקֹ֣ד עַל־מֶֽלֶךְ־בָּבֶל֩ וְעַל־הַגּ֨וֹי הַה֧וּא נְאֻם־יְהֹוָ֛ה אֶת־עֲוֺנָ֖ם וְעַל־אֶ֣רֶץ כַּשְׂדִּ֑ים וְשַׂמְתִּ֥י אֹת֖וֹ לְשִֽׁמְמ֥וֹת עוֹלָֽם׃

(11) This whole land shall be a desolate ruin.

And those nations shall serve the king of Babylon seventy years.
(12) When the seventy years are over, I will punish the king of Babylon and that nation and the land of the Chaldeans for their sins—declares the LORD—and I will make it a desolation for all time.
כמלאות–complete
אפקוד– I will punish

(י) כִּֽי־כֹה֙ אָמַ֣ר יְהֹוָ֔ה כִּ֠י לְפִ֞י מְלֹ֧את לְבָבֶ֛ל שִׁבְעִ֥ים שָׁנָ֖ה אֶפְקֹ֣ד אֶתְכֶ֑ם וַהֲקִמֹתִ֤י עֲלֵיכֶם֙ אֶת־דְּבָרִ֣י הַטּ֔וֹב לְהָשִׁ֣יב אֶתְכֶ֔ם אֶל־הַמָּק֖וֹם הַזֶּֽה׃

(10) For thus said the LORD: When Babylon’s seventy years are over, I will take note of you, and I will fulfill to you My promise of favor—to bring you back to this place.

אֲמַר: אִיהוּ מִיטְעָא טָעֵי, אֲנָא חָשֵׁיבְנָא וְלָא טָעֵינָא. מִי כְּתִיב ״לְמַלְכוּת בָּבֶל״? ״לְבָבֶל״ כְּתִיב, מַאי ״לְבָבֶל״? לְגָלוּת בָּבֶל, כַּמָּה בְּצִירָן — תַּמְנֵי, חַשֵּׁיב וְעַיֵּיל חִילּוּפַיְיהוּ חֲדָא דְּבֵלְשַׁצַּר, וַחֲמֵשׁ דְּדָרְיָוֶשׁ וְכוֹרֶשׁ, וְתַרְתֵּי דִּידֵיהּ — הָא שִׁבְעִין. כֵּיוָן דְּחָזֵי דִּמְלוֹ שִׁבְעִין וְלָא אִיפְּרוּק — אֲמַר: הַשְׁתָּא וַדַּאי תּוּ לָא מִיפַּרְקִי, אַפֵּיק מָאנֵי דְּבֵי מַקְדְּשָׁא וְאִשְׁתַּמַּשׁ בְּהוּ. בָּא שָׂטָן וְרִיקֵּד בֵּינֵיהֶן וְהָרַג אֶת וַשְׁתִּי.

Ahasuerus said: He, Belshazzar, erred. I too will calculate, but I will not err, thinking he understood the source of Belshazzar’s mistake. Is it written: “Seventy years for the kingdom of Babylonia”? It is written: “Seventy years for Babylonia.” What is meant by “for Babylonia”? These words are referring to the seventy years for the exile of Babylonia. How many years are still lacking from the seventy years? Eight years. He calculated, and inserted in their stead one year of Belshazzar, and five years of Darius and Cyrus, and two years of his own, bringing the total to seventy. Once he saw that seventy years had been completed, and the Jewish people were still not redeemed, he said: Now for sure they will not be redeemed. Therefore, I will take out the vessels of the Temple and use them. What happened to him? As a punishment for what he did, the Satan came and danced among them, and brought confusion to his celebration until he killed Vashti.

When do these 70 years start?
אחשורוש understood "seventy years of Babylon" to mean 70 years from the exile of the kingdom. He calculated 70 years from the exile of יהויכין; one of the reasons for the feast 3 years into his rule.
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