Genesis 1:17-20

God placed them in the expanse of the heavens to provide light upon the earth, to rule over the day and the night, and to separate the light from the darkness; and God saw that it was good and He affirmed and sustained it. And there was evening and there was morning, a fourth day. Then God said, “Let the waters swarm and abundantly produce living creatures, and let birds soar above the earth in the open expanse of the heavens.”