Genesis 1:14

God had not yet made animals and people. Later, when he made them, they would need periods to be active and periods to rest. So God made the sun and the moon divide time into days and months and years.

God creates animals

v20 After that, God said, ‘Let the waters produce many living animals. And let birds fly in the sky above the earth.’ v21 So God created large animals in the sea. He created every animal that moves in the water. They were many different kinds. He also created every bird that has wings. And God saw that it was good. v22 God promised good things to them. He said, ‘Have large families. Increase so that you fill the seas and the skies.’ v23 And there was evening and there was morning. It was the fifth day.