For, whatever was the form and expression which was then given to the clay (by the Creator) Christ was in His thoughts as one day to become man, because the Word, too, was to be both clay and flesh, even as the earth was then. For so did the Father previously say to the Son: “Let us make man in our own image, after our likeness.” And God made man, that is to say, the creature which He moulded and fashioned; after the image of God (in other words, of Christ) did He make him. And the Word was God also, who being in the image of God, “thought it not robbery to be equal to God.” Thus, that clay which was even then putting on the image of Christ, who was to come in the flesh, was not only the work, but also the pledge and surety, of God.
Tertullian
On the Resurrection of the Flesh
Chapter VI