Genesis 1:4

1:4 God saw that the light was good, so God separated the light from the darkness.

Genesis 1:6

1:6 God said, “Let there be an expanse in the midst of the waters and let it separate water from water.

Genesis 1:18

1:18 to preside over the day and the night, and to separate the light from the darkness. God saw that it was good.

Genesis 1:7

1:7 So God made the expanse and separated the water under the expanse from the water above it. It was so.

Genesis 1:14

1:14 God said, “Let there be lights in the expanse of the sky to separate the day from the night, and let them be signs to indicate seasons and days and years,