Genesis 1:7 ASV

⁵  And God called the light Day, and the darkness he called Night. And there was evening and there was morning, one 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.

⁸  And God called the firmament Heaven. And there was evening and there was morning, a second day.

⁹  And God said, Let the waters under the heavens be gathered together unto one place, and let the dry land appear: and it was so.