Genesis 1:3-8

3 Then God said, “Let there be light”; and there was light. 4 God saw that the light was good; and God separated the light from the darkness. 5 God called the light day, and the darkness He called night. And there was evening and there was morning, one day. 6 Then God said, “Let there be an expanse in the midst of the waters, and let it separate the waters from the waters.” 7 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. 8 God called the expanse heaven. And there was evening and there was morning, a second day.