Zohar, Vayetzei
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כְּתִיב, (בראשית א׳:י״ז) וַיִּתֵּן אֹתָם אֱלהִים בִּרְקִיעַ הַשָּׁמָיִם, דָּא צַדִּיק. וְאַף עַל גַּב דְּאִתְּמָר בִּרְקִיעַ הַשָּׁמַיִם, אֶלָּא בִּרְקִיעַ הַשָּׁמַיִם וַדַּאי, דְּאִיהוּ סִיּוּמָא דְגוּפָא.
The Zohar; London, Soncino Press, 1933
This Zaddik is also called “the firmament of the heaven” (Gen. 1, 17).