The rabbis enumerate seven heavens and identify Aravot as the highest, associated with righteousness, justice, peace, the souls of the righteous, and the divine presence. This is the central Chazal source for the heavenly Aravot.
עֲרָבוֹת — שֶׁבּוֹ צֶדֶק מִשְׁפָּט וּצְדָקָה, גִּנְזֵי חַיִּים וְגִנְזֵי שָׁלוֹם וְגִנְזֵי בְרָכָה, וְנִשְׁמָתָן שֶׁל צַדִּיקִים, וְרוּחוֹת וּנְשָׁמוֹת שֶׁעֲתִיד[וֹת] לְהִיבָּרְאוֹת, וְטַל שֶׁעָתִיד הַקָּדוֹשׁ בָּרוּךְ הוּא לְהַחֲיוֹת בּוֹ מֵתִים. צֶדֶק וּמִשְׁפָּט — דִּכְתִיב: ״צֶדֶק וּמִשְׁפָּט מְכוֹן כִּסְאֶךָ״. צְדָקָה — דִּכְתִיב: ״וַיִּלְבַּשׁ צְדָקָה כַּשִּׁרְיָן״. גִּנְזֵי חַיִּים — דִּכְתִיב: ״כִּי עִמְּךָ מְקוֹר חַיִּים״. וְגִנְזֵי שָׁלוֹם — דִּכְתִיב: ״וַיִּקְרָא לוֹ ה׳ שָׁלוֹם״. וְגִנְזֵי בְרָכָה — דִּכְתִיב: ״יִשָּׂא בְרָכָה מֵאֵת ה׳״. נִשְׁמָתָן שֶׁל צַדִּיקִים — דִּכְתִיב: ״וְהָיְתָה נֶפֶשׁ אֲדוֹנִי צְרוּרָה בִּצְרוֹר הַחַיִּים אֵת ה׳ אֱלֹהֶיךָ״. רוּחוֹת וּנְשָׁמוֹת שֶׁעֲתִיד[וֹת] לְהִיבָּרְאוֹת — דִּכְתִיב: ״כִּי רוּחַ מִלְּפָנַי יַעֲטוֹף וּנְשָׁמוֹת אֲנִי עָשִׂיתִי״. וְטַל שֶׁעָתִיד הַקָּדוֹשׁ בָּרוּךְ הוּא לְהַחְיוֹת בּוֹ מֵתִים — דִּכְתִיב: ״גֶּשֶׁם נְדָבוֹת תָּנִיף אֱלֹהִים נַחֲלָתְךָ וְנִלְאָה אַתָּה כוֹנַנְתָּהּ״. שָׁם אוֹפַנִּים וּשְׂרָפִים וְחַיּוֹת הַקֹּדֶשׁ, וּמַלְאֲכֵי הַשָּׁרֵת, וְכִסֵּא הַכָּבוֹד, מֶלֶךְ אֵל חַי רָם וְנִשָּׂא שׁוֹכֵן עֲלֵיהֶם בָּעֲרָבוֹת, שֶׁנֶּאֱמַר: ״סוֹלּוּ לָרוֹכֵב בָּעֲרָבוֹת בְּיָהּ שְׁמוֹ״, וּמְנָלַן דְּאִיקְּרִי ״שָׁמַיִם״? אָתְיָא ״רְכִיבָה״ ״רְכִיבָה״, כְּתִיב הָכָא: ״סוֹלּוּ לָרוֹכֵב בָּעֲרָבוֹת״ וּכְתִיב הָתָם: ״רוֹכֵב שָׁמַיִם בְּעֶזְרֶךָ״.
Aravot, skies, is the firmament that contains righteousness; justice; righteousness, i.e., charity; the treasuries of life; the treasuries of peace; the treasuries of blessing; the souls of the righteous; the spirits and souls that are to be created; and the dew that the Holy One, Blessed be He, will use to revive the dead. The Gemara proves this statement: Righteousness and justice are found in heaven, as it is written: “Righteousness and justice are the foundation of Your throne” (Psalms 89:15); righteousness, as it is written: “And He donned righteousness as armor” (Isaiah 59:17); the treasuries of life, as it is written: “For with You is the source of life” (Psalms 36:10). And the treasuries of peace are found in heaven, as it is written: “And he called Him the Lord of peace” (Judges 6:24), implying that peace is God’s name and is therefore found close to Him. And the treasuries of blessing, as it is written: “He shall receive a blessing from the Lord” (Psalms 24:5). The souls of the righteous are found in heaven, as it is written: “And the soul of my master shall be bound in the bundle of life with the Lord, your God” (I Samuel 25:29). Spirits and souls that are to be created are found there, as it is written: “For the spirit that enwraps itself is from Me, and the souls that I have made” (Isaiah 57:16), which indicates that the spirit to be released into the world, wrapped around a body, is located close to God. The dew that the Holy One, Blessed be He, will use to revive the dead is found in heaven, as it is written: “A bountiful rain You will pour down, God; when Your inheritance was weary, You confirmed it” (Psalms 68:10). There, in the firmaments, are the ofanim, the seraphim, the holy divine creatures, and the ministering angels, and the Throne of Glory. The King, God, the living, lofty, exalted One dwells above them in Aravot, as it is stated: “Extol Him Who rides upon the skies [Aravot], Whose name is God” (Psalms 68:5). And from where do we derive that Aravot is called “heaven”? This is learned by using a verbal analogy between two instances of “rides” and “rides”: Here, it is written: “Extol Him Who rides upon the skies [Aravot],” and there, it is written: “Who rides upon the heaven as your help” (Deuteronomy 33:26).