Genesis 1:7
Douay-Rheims
And God made a firmament, and divided the waters that were under the firmament, from those that were above the firmament, and it was so.
Augustine of Hippo
The waters were divided so that some were above the firmament and others below the firmament. Since we said that matter was called water, I believe that the firmament of heaven separated the corporeal matter of visible things from the incorporeal matter of invisible things.
Source details
A.D. 430 · on Gen 1:7 (TWO BOOKS ON GENESIS AGAINST THE MANICHAEANS 1.11.17)
Imported from an open dataset — not yet checked against the printed edition.