Excerpt from "The Epistle of Barnabas"

But let us inquire whether there really is a temple of God. There is — there where He Himself says He is building and perfecting it!... I find, therefore, that there is a temple. How, then, will it be built up in the name of the Lord? Let me tell you. Before we believed in God, our little house, the heart, was decrepit and infirm, really like a temple built by hand; in fact, it was a nest of idolatry and a haunt of demons, because it was at enmity with God. It will be built in the name of the Lord. See to it that the temple of the Lord is built in splendour! How? Let me tell you. By receiving the forgiveness of sins and trusting in the Name, we were made new, being created all over again. That is why our little house — in us — there really dwells God.

The Epistle of Barnabas (1st–2nd Century A.D.) is early Christian work of disputed authorship. Although most popularly considered to have been written by Barnabas, a disciple of Christ’s mentioned in the Acts of the Apostles, most scholars agree that the author’s erroneous understanding of the relationship between Old and New Testaments disproves the popular view. The epistle attempts to impart perfect knowledge of how to achieve salvation — while offering an often specious critique of the Jewish understanding of the Old Testament.