In the beginning of God's creation of the heavens and the earth.
Now the earth was astonishingly empty, and darkness was on the face of the deep, and the spirit of God was hovering over the face of the water.
And God said, "Let there be light," and there was light.
And God saw the light that it was good, and God separated between the light and between the darkness. (1)
And God called the light day, and the darkness He called night, and it was evening and it was morning, one day.

(1) Rashi's Commentary on Verse 4 :  "And God saw the light that it was good, and God separated: Here too, we need the words of the Aggadah: He saw it that it was not proper for the wicked to use it; so He separated it for the righteous in the future. According to its simple meaning, explain it as follows: He saw it that it was good, and it was unseemly that it [light] and darkness should serve in confusion; so He established for this one its boundary by day, and for that one its boundary by night."