Genesis 3:1

Gen. 3, at the beginning. " Now the serpent was more subtle," etc. What is an argument ex posteriori of the devil's having assumed the form of a serpent in his temptation of our first parents, is the pride he has ever since taken of being worshipped under that form, to insult, as it were, and trample upon fallen man. To this purpose we may observe that the serpent has all along been the common symbol and representation of the heathen deities, Jul. Firmic. de errore Profan. Relig. p. 15. That the Babylonians worshipped a dragon, we may learn from the Apocrypha, and that they had images of serpents in the temple of Belus, Diodorus Siculus, lib. 2. cap. 4, informs us. Grotius out of several ancient authors, has made it appear that in the old Greek mysteries they used to carry about a serpent, and cry, [the Hebrew word for] the devil, thereby expressing his triumph in the unhappy deception of our first mother. The story of Ophis among the heathen was taken from the devil's assuming the body of a serpent in his tempting of Eve. Orig. contra Celsus, lib 6. And to name no more what Philip Melancthon tells us of some priests in Asia, is very wonderful, viz. that they carry about a serpent in a brazen vessel, which they attend with a great deal of music, and many choruses in verse, while the serpent every now and then lifts up himself, opens his mouth, and thrusts out the head of a beautiful virgin, (as having swallowed her), 'to show the devil's triumph in this miscarriage among those poor deluded idolaters.' Nicol's Conference with a Theist, vol. 1.

Gen. 3:14