And God said, “Let there be an expanse in the midst of the waters, and let it separate the waters from the waters.”
6 Let there be a firmament “Sit extensio.” In the next verse he changes the word to “expansio”. “Fecit expansionem.” — “He made an expanse.” The work of the second day is to provide an empty space around the circumference of the earth, that heaven and earth may not be mixed together.
We have here an account of the second day's work, the creation of the firmament, in which observe, 1. The command of God concerning it: Let there be a firmament, an expansion, so the Hebrew word signifies, like a sheet spread, or a curtain drawn out.
Commenting on Genesis 1:6-8
And God said, let there be a firmament in the midst of the waters,.... On which the Spirit of God was sitting and moving, Gen 1:2 part of which were formed into clouds, and drawn up into heaven by the force of the body of fire and light already produced; and the other part left on the earth, not yet gathered into one place, as...