Genesis 1:6
And God said, “Let there be an expanse between the waters, to separate the waters from the waters.”
What it says
God calls for an expanse between the waters to separate one body of water from another.
What it is doing
This verse announces the second day's act of division.
In context
6And God said, “Let there be an expanse between the waters, to separate the waters from the waters.” 7So God made the expanse and separated the waters beneath it from the waters above. And it was so. 8God called the expanse “sky.”