Genesis 1:7

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

(New International Version)

God made the expanse, and separated the waters which were below the expanse from the waters which were above the expanse; and it was so.

(New American Standard Bible)

And 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.

(King James Version)