Cosmas Indicopleustes

But some one will say that it is recorded that He made the heaven and the earth, while nothing is recorded of waters and fire and air. In the first place then, brethren, when He said that the heaven and the earth were made, He indicated by the things which contain, the things that are contained. Then after the interposition of a few passages, hear Him next relate when the air was made: And the spirit of God moved upon the face of the waters. …

The Christian Topography, Book 10 ↗

Augustine of Hippo

The earth was invisible and unorganized, and darkness was over the abyss. Formlessness is suggested by these words, so that we might grasp the meaning by degrees, for we are unable to think cognitively about an absolute privation of form that still does not go as far as nothing. From this, another visible and organized heaven and earth were to be made.

Confessions 12.15 ↗

Ambrose of Milan

The good architect lays the foundation first and afterward, when the foundation has been laid, plots the various parts of the building, one after the other, and then adds to it the ornamentation.… Scripture points out that things were first created and afterward put in order lest it be supposed that they were not actually created and that they had no beginning, just as if the nature of things had been, as it were, generated from the beginning and did not appear to be something added afterward.

The Six Days of Creation ↗

Jerome

And the spirit of God was moving over the waters. Because in our books it is written 'was moving', in Hebrew it has 'Merefeth', which we can call 'hovering' or 'brooding', in the likeness of a bird, warming the eggs with the heat of life. From which we understand that it is not said to be the spirit of the world, as some suppose, but the Holy Spirit, who is also said to be the giver of life to all things from the beginning. And if a giver of life, then also a creator. But if You are the creator and God. …

Hebrew Questions on Genesis ↗