Gen.1.7

God made sky. He separated the water under sky from the water above sky. And there it was:

Gen.1.7

So God made the expanse and separated the water under the expanse from the water above it. And it was so.

Gen.1.7

Thus God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament; and it was so.

Gen.1.7

And so it was. God made this space to separate the waters above from the waters below.