Nicene and Post Nicene-Fathers, Vol. I:
The Confessions: Chapter XXXVI

Chapter XXXVI.—The Seventh Day, Without Evening and Setting, the Image of Eternal Life and Rest in God.

51. But the seventh day is without any evening, nor hath it any setting, because Thou hast sanctified it to an everlasting continuance that that which Thou didst after Thy works, which were very good, resting on the seventh day, although in unbroken rest Thou madest them that the voice of Thy Book may speak beforehand unto us, that we also after our works (therefore very good, because Thou hast given them unto us) may repose in Thee also in the Sabbath of eternal life.