God creates light on the first day when he says, “Let there be light” Genesis 1:3–5. He separates the light from the darkness and names them “Day” and “Night.”
In Genesis 1:3–5, God creates by speaking: light appears because God commands it. God then evaluates what is made, calling the light “good,” and establishes an ordered distinction between light and darkness. Next God assigns names—“Day” and “Night”—which marks these realities as recognized parts of an organized world. These verses come at the start of Genesis’s opening creation account, where the narrative moves in a steady pattern: God speaks, something happens, God responds to what is made, and the world becomes more ordered.
Genesis 1:3–5 presents creation as happening by God’s spoken command: God says light should exist, and light appears. The narrative then adds God’s assessment (“good”), an act of separating light from darkness (not deleting darkness), and an act of naming (“Day” and “Night”).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Genesis 1:3-5, then read the surrounding section so the answer stays connected to the passage's flow.
3God said, "Let there be light," and there was light.
4God saw the light, and saw that it was good. God divided the light from the darkness.
5God called the light Day, and the darkness he called Night. There was evening and there was morning, one day.