Exodus 40:17שמות מ׳:י״ז
In the first month of the second year, on the first of the month, the Tabernacle was set up.
וַיְהִ֞י בַּחֹ֧דֶשׁ הָרִאשׁ֛וֹן בַּשָּׁנָ֥ה הַשֵּׁנִ֖ית בְּאֶחָ֣ד לַחֹ֑דֶשׁ הוּקַ֖ם הַמִּשְׁכָּֽן׃
Shabbat 87b:6שבת פ״ז ב:ו׳
Rav Ḥavivi from Ḥozena’a said to Rav Ashi: Come and hear a different proof from the following verse: “And it came to pass in the first month in the second year, on the first day of the month, that the Tabernacle was erected” (Exodus 40:17). It was taught: That day took ten crowns. It was the first day of Creation, meaning Sunday, the first day of the offerings brought by the princes, the first day of the priesthood, the first day of service in the Temple, the first time for the descent of fire onto the altar, the first time that consecrated foods were eaten, the first day of the resting of the Divine Presence upon the Jewish people, the first day that the Jewish people were blessed by the priests, and the first day of the prohibition to bring offerings on improvised altars. Once the Tabernacle was erected, it was prohibited to offer sacrifices elsewhere. And it was the first of the months. And from the fact that the New Moon of Nisan of that year was on the first day of the week, in the previous year, it was on the fourth day of the week.
אֲמַר לֵיהּ רַב חֲבִיבִי מָחוֹזְנָאָה לְרַב אָשֵׁי, תָּא שְׁמַע: ״וַיְהִי בַּחֹדֶשׁ הָרִאשׁוֹן בַּשָּׁנָה הַשֵּׁנִית בְּאֶחָד לַחֹדֶשׁ הוּקַם הַמִּשְׁכָּן״ — תָּנָא, אוֹתוֹ יוֹם נָטַל עֶשֶׂר עֲטָרוֹת: רִאשׁוֹן לְמַעֲשֵׂה בְרֵאשִׁית; רִאשׁוֹן לַנְּשִׂיאִים; רִאשׁוֹן לַכְּהוּנָּה; רִאשׁוֹן לָעֲבוֹדָה; רִאשׁוֹן לִירִידַת הָאֵשׁ; רִאשׁוֹן לַאֲכִילַת קָדָשִׁים; רִאשׁוֹן לִשְׁכּוֹן שְׁכִינָה; רִאשׁוֹן לְבָרֵךְ אֶת יִשְׂרָאֵל; רִאשׁוֹן לְאִיסּוּר הַבָּמוֹת; רִאשׁוֹן לֶחֳדָשִׁים. וּמִדְּרֵישׁ יַרְחָא דְנִיסָן דְּהָא שַׁתָּא חַד בְּשַׁבָּא — דְּאֶשְׁתָּקַד בְּאַרְבְּעָה.