John Chrysostom: Moses' the Deliveryman, not Author of Letters

At the beginning, then, God communicates directly with human beings as far as it is possible for human beings to hear. This is the way He came to Adam, this the way He rebuked Cain, this the way He was entertained by Abraham. But since our nature took a turn for evil, and separated itself by a lengthy exile, as it were, at long last He sent us letters as though we were absent for a long time and He intended to reestablish the former friendship through an epistle. While it was God who sent the letters, it was Moses who brought them.

- John Chrysostom (around A.D. 347 to around A.D. 407), Sermon 1 on Genesis, in St. John Chrysostom, Eight Sermons on the Book of Genesis, p. 26 (2004), Robert C. Hill translator.