John Wesley on Exodus 33:23

And I will take away my hand - Speaking after the manner of men. And thou shalt see my back - parts - The face in man is the seat of majesty, and men are known by their faces, in them we take a full view of men; that sight of God Moses might not have, but such a sight as we have of a man who is gone past us, so that we only see his back. Now Moses was allowed to see this only, but when he was a witness to Christ's transfiguration, he saw his face shine as the sun.