Genesis 1:6 in the World English Bible
God said, “Let there be an expanse in the middle of the waters, and let it divide the waters from the waters.”
Context
5 And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
6 And God said, Let there be a firmament in the midst of the waters, and let it divide the waters from the waters.
7 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.