New answers tagged commentaries
There is definitely a tradition of Jewish commentary from that era, though Jewish practice was intent on keeping such traditions oral until about the 3rd Century of the Common Era (CE). Genesis Rabbah (reference by Yishai) may or may not fit the bill for your purposes, although it does contain traditions that likely originate centuries before it was ...
I think what you are looking for is Genesis Rabbah, which seems to be around the same time (perhaps a century earlier - I'm uncertain as I'm not familiar with the Hexameron, and only know what a quick look at Wikipedia told me). There are various English translations available online and in book stores.
Top 50 recent answers are included