And God said, "Let there be light," and there was light. And God saw that the light was good. And God separated the light from the darkness. God called the light Day, and the darkness, he called Night. And there was evening and there was morning, the first day. - Genesis 1:3-5
"While the earth remains, seedtime and harvest, cold and heat, summer and winter, day and night, shall not cease.” - Genesis 8:22
Greek Mythology
Earth, Erebus, and Love were the first beings. Love issued from the egg of Night, which floated on Chaos.