Tertullian

But we do confess that a kingdom is promised to us upon the earth, although before heaven, only in another state of existence; inasmuch as it will be after the resurrection for a thousand years in the divinely-built city of Jerusalem, "let down from heaven," [Revelation 21:2] which the apostle also calls "our mother from above;" [Galatians 4:26] and, while declaring that our πολίτευμα, or citizenship, is in heaven, he predicates of it that it is really a city in heaven. This both Ezekiel had knowledge of [Ezekiel 48:30-35] and the Apostle John beheld. [Revelation 21:10-23] And the word of the new prophecy which is a part of our belief, attests how it foretold that there would be for a sign a picture of this very city exhibited to view previous to its manifestation. This prophecy, indeed, has been very lately fulfilled in an expedition to the East. For it is evident from the testimony of even heathen witnesses, that in Judæa there was suspended in the sky a city early every morning for forty days. As the day advanced, the entire figure of its walls would wane gradually, and sometimes it would vanish instantly. We say that this city has been provided by God for receiving the saints on their resurrection, and refreshing them with the abundance of all really spiritual blessings, as a recompense for those which in the world we have either despised or lost; since it is both just and God-worthy that His servants should have their joy in the place where they have also suffered affliction for His name's sake. Of the heavenly kingdom this is the process. After its thousand years are over, within which period is completed the resurrection of the saints, who rise sooner or later according to their deserts there will ensue the destruction of the world and the conflagration of all things at the judgment: we shall then be changed in a moment into the substance of angels, even by the investiture of an incorruptible nature, and so be removed to that kingdom in heaven of which we have now been treating, just as if it had not been predicted by the Creator, and as if it were proving Christ to belong to the other god and as if he were the first and sole revealer of it.