Targum Jerusalem, Exodus
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אִיפוּפְרִין דְּרִיגְלוֹי כְּעוֹבַד לָבָן דְּסַפִּירִינוּן וּכְחֵיזוּ שְׁמַיָא כַּד הֲווֹ נַקְיָין מִן עֲנָנַיָא:
Targum Jerusalem, trans. J. W. Etheridge, London, 1862
The footstool of His feet as the work of pure sapphire stones, and as the aspect of the heavens when they are cleared from clouds.