The Firmament is spoken of in the beginning.
It is to come at the end,
so that the first becomes the last
and the last first.
It contains the Lights of Heaven.
The Greater, the Lesser and the Stars also.
Its purpose is to separate darkness from Light,
for darkness can not have with Light.

The spiritual works of the marvelous Firmament are purified with salt. They are spirits of knowledge, truth and righteousness in the Holy of Holies, forms of the living angels, forms of the light giving spirits. -DSS 4Q405 19

“Moreover the light of the Moon shall be as the light of the Sun, and the light of the Sun shall be sevenfold, as the light of seven days, in the day that the LORD binds up the breach of His people, and heals the stroke of their wound.” – Isaiah 30:26

“And after six days Jesus takes Peter, James and John… and  bringht them up into an high mountain apart, and was  transfigured before them: and his face did shine as the Sun…” – Matthew 17:1-2

Jesus said, “I must work the works of Him that sent me, while it  is day: the night is coming, when no one can work. As long as I am in the world, I am the light of the world.” – John 9:4-5

“And there shall be signs in the Sun and in the Moon and in the Stars; and on the earth distress of nations, with perplexity; the sea and the waves roaring; men’s hearts failing them because of fear and because of seeing those things which are coming on the earth: and then shall they see the Son of Adam coming in the clouds with power and great glory. And when these things begin to come to pass, then look up and lift up your heads; for your redemption draws near!” – Luke 21:25-28

Jesus was the light of the world, the Sun, the light of day, and he spoke of a night that was coming. Who then are the lights by night, the Moon and the Stars? And what will they do to the wicked shepherds, the wicked hirelings in the vineyard of the LORD, and the thieves in the Temple?