Genesis 1:6
Douay-Rheims
And God said: Let there be a firmament made amidst the waters: and let it divide the waters from the waters.
Cosmas Indicopleustes
First of all, it is proved from the account of the creation that God divided the one place which extends from the earth to the first heaven, by placing in the middle the firmament, that is, the second heaven, thus making the one place into two places.
Source details
on Gen 1:6-7 (The Christian Topography, Book 6)
Imported from an open dataset — not yet checked against the printed edition.