Augustine of Hippo

Heaven, too, will be the fulfillment of that sabbath rest foretold in the command: "Be still and see that I am God." This, indeed, will be that ultimate sabbath that has no evening and that the Lord foreshadowed in the account of his creation: "And God rested on the seventh day from all his work that he had done. …

City of God 22.30 ↗

Ambrose of Milan

He created heaven and earth at the time when the months began, from which time it is fitting that the world took its rise. Then there was the mild temperature of spring, a season suitable for all things. Consequently the year too has the stamp of a world coming to birth.… In order to show that the creation of the world took place in the spring, Scripture says: "This month shall be to you the beginning of months, it is for you the first in the months of the year," calling the first month the springtime. …

The Six Days of Creation ↗

Bede

And He blessed the seventh day and sanctified it, because on it He had rested from all His work which God had created and made. That is, having completed the adornment of the world, He had ceased from instituting new kinds of things. Nor should this be considered contrary to the saying in the Gospel: My Father works until now, and I work (John 5:17). Clearly responding to those who complained that the Sabbath was not observed by Him, invoking the authority of this ancient Scriptural rest of God. …

Commentary on Genesis (Hexaemeron) ↗