Exodus 20:1

Description: Reference proving heaven and earth were created on the first day, not before it.

Chapter I (The Six Days of Creation)

In the Beginning: Nine Interpretations — Proves that heaven and earth were created on the very first day
"that they were created not before, but on the very first day, that is, at the beginning of the first day, before light was produced, is clear from Ex. 20:1."