Genesis 1:5-7

Revised Standard Version Catholic Edition

⁵ 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 separate the waters from the waters.” ⁷ And God made the firmament and separated the waters which were under the firmament from the waters which were above the firmament. And it was so.