Genesis 2:4

I mean, when it said heaven and earth, it included everything together in those words, both things on earth and things in heaven. So just as in its account of created things it doesn't mention them all one by one but gives a summary of related items and makes no further attempt to describe them to us, so too it called the whole book the book about the origins of heaven and earth, even though it contains many other things, evidently leaving us to work out from the reference to these two that all visible things are of necessity contained in this book, both those in heaven and those on earth.

Understand, O hearer, that although the days of creation were finished and God had blessed the sabbath day, which was sanctified, and he had completed his account, Moses still returned to tell the story of the beginning of creation even after the days of creation had been finished. "These are the generations of the heavens and the earth," that is, this is the account of the fashioning of heaven and earth on the day when the Lord made heaven and earth, for as yet "no plant of the field was in the earth and no herb of the field had yet sprung up." Even if these things were not actually created on the first day—for they had been made on the third day—still Moses did not rashly introduce, on the first day, the report of those things that were created on the third day. For Moses said, "No plant of the field was yet in the earth and no herb of the field had yet sprung up—for the Lord God had not caused it to rain upon the earth, but a mist went up from the earth and watered the whole face of the ground." Because everything that has been born and will be born from the earth will be through the conjunction of water and earth, Moses undertook to show that no plant or vegetation had been created along with the earth, because the rain had not yet come down. But after the great mist rose up from the great abyss and watered the whole face of earth and after the waters had been gathered together on the third day, then the earth brought forth all the vegetation.

After speaking about the Sabbath rest, and how God had blessed and sanctified this day, Scripture returns to the narrative of the initial establishment of creation, this time passing over, with only a few words, things it had already spoken of and recounting at greater length matters it had previously omitted. Thus it begins to describe the history of creation for a second time: "These are the generations of heaven and earth when they were created on the day that God made heaven and earth. None of the trees of the field was yet in existence, and the vegetation had not yet sprouted, seeing that He had not yet caused rain to fall on the earth, and Adam was not there to work on the earth. A fountain went up and irrigated the surface of the earth." [ Gen. 2:4 ] You should realize, reader, that even though the days of creation were completed and Scripture had pronounced a blessing on the Sabbath day that had been sanctified and had brought it to a close, it now reverts to narrating the very beginning of the acts of creation, even though the days of these acts had come to an end. "These are the generations of heaven and of earth," [ Gen2:4 ] that is to say, this is the narrative of the establishment of heaven and earth "on the day that the Lord made heaven and earth, for none of the trees of the field had yet come into being, and the vegetation had not sprouted." [ Gen. 2:5 ] It is quite true that these had not been created, seeing that these were made on the third day. [ cf. Gen. 1:9-13 ] Now it was not without reason that Scripture introduced on the first day mention of things created on the third.