It is written, "Moses made a serpent of bronze (and) hung it upon a pole...Whoever will gaze upon this bronze serpent, none will destroy him. Whoever will believe in this bronze serpent will be saved." For this is Christ. Those who believed in him have received life. Those who did not believe will die. What then is this faith?
The Testimony of Truth 48.31-49.11 (anonymous Gnostic text, probably from Alexandria, early second century).