'Firmament' in the Bible

And God said, “Let there be an expanse [of the sky] in the midst of the waters, and let it separate the waters [below the expanse] from the waters [above the expanse].”

And God made the expanse [of sky] and separated the waters which were under the expanse from the waters which were above the expanse; and it was so [just as He commanded].

God called the expanse [of sky] heaven. And there was evening and there was morning, a second day.

The heavens are telling of the glory of God;And the expanse [of heaven] is declaring the work of His hands.

Who lays the beams of His upper chambers in the waters [above the firmament],Who makes the clouds His chariot,Who walks on the wings of the wind,

“When He established the heavens, I [Wisdom] was there;When He drew a circle upon the face of the deep,

Now stretched over the heads of the living beings there was something like an expanse, looking like the terrible and awesome shimmer of icy crystal.

Under the expanse their wings were stretched out straight, one toward another. Every living being had two wings which covered its body on one side and on the other side.

And there was a voice above the expanse that was over their heads; whenever they stopped, they lowered their wings.

Now above the expanse that was over their heads there was something resembling a throne, it appeared like [it was made of] sapphire or lapis lazuli; and [seated] on that which looked like a throne, high up, was a figure with the appearance of a man.

Then the Spirit lifted me up, and I heard a great rushing sound behind me, “Blessed be the glory of the Lord in His place [above the expanse].”

Then I looked, and behold, in the expanse (firmament) that was over the heads of the cherubim there appeared something [glorious and brilliant] above them looking like a [huge] sapphire stone, formed to resemble a throne.

Those who are [spiritually] wise will shine brightly like the brightness of the expanse of heaven, and those who lead many to righteousness, [will shine] like the stars forever and ever.