Job 37:14-18

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KJV

¹⁴Hearken unto this, O Job: stand still, and consider the wondrous works of God.
¹⁵Dost thou know when God disposed them, and caused the light of his cloud to shine?
¹⁶Dost thou know the balancings of the clouds, the wondrous works of him which is perfect in knowledge?
¹⁷How thy garments are warm, when he quieteth the earth by the south wind?
¹⁸Hast thou with him spread out the sky, which is strong, and as a molten looking glass?

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See The Firmament. The sky is "strong", "hard as a molten mirror" (RSV, NRSV, etc).