And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.
All Commentaries on Genesis 1:5 Go To Genesis 1
Ephrem The Syrian
So let no one think that there is anything allegorical in the works of the six days. No one can rightly say that the things pertaining to these days were symbolic, nor can one say that they were meaningless names or that other things were symbolized for us by their names. Rather, let us know in just what manner heaven and earth were created in the beginning. They were truly heaven and earth. There was no other thing signified by the names “heaven” and “earth.” The rest of the works and things made that followed were not meaningless significations either, for the substances of their natures correspond to what their names signify.