6 Bible Verses about Firmament

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.

Then God said, “Let the waters swarm and abundantly produce living creatures, and let birds soar above the earth in the open expanse of the heavens.”

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

And God said, Let there be a firmament [the expanse of the sky] in the midst of the waters, and let it separate the waters [below] from the waters [above]. And God made the firmament [the expanse] and separated the waters which were under the expanse from the waters which were above the expanse. And it was so. And God called the firmament Heavens. And there was evening and there was morning, a second day.

And God said, Let there be lights in the expanse of the heavens to separate the day from the night, and let them be signs and tokens [of God's provident care], and [to mark] seasons, days, and years, And let them be lights in the expanse of the sky to give light upon the earth. And it was so. And God made the two great lights -- "the greater light (the sun) to rule the day and the lesser light (the moon) to rule the night. He also made the stars. read more.
And God set them in the expanse of the heavens to give light upon the earth,