393 · Jerome, Against Jovinianus (Adversus Iovinianum) 2.28
But when Jovinianus supposes that the many mansions in our Father’s house are churches scattered throughout the world, who can refrain from laughing; since Scripture plainly teaches in John’s Gospel that our Lord was discoursing not of the number of the churches, but of the heavenly mansions, and the eternal tabernacles for which the prophet longed?“In my Father’s house,” He says, “are many mansions: if it were not so, I would have told you; for I go to prepare a place for you. And if I go and prepare a place for you I will come again, and will receive you unto myself, that where I am, there ye may be also.” The place and the mansions which Christ says He would prepare for the apostles are of course in the Father’s house, that is, in the kingdom of heaven, not on earth, where for the present He was leading the apostles.