The Evolution of Satan

In Revelation 20, it refers to the serpent of old and seems to try to make this connection. I don't know of one of these non-biblical texts that identifies the serpent with Satan prior to the book of Revelation. But what we do know, and you can see from reading the Gospels, especially Matthew, is that once there were Jewish believers in Jesus as the Messiah, they reread the Hebrew Bible,. They reread it to find where's Jesus? Of course they found Jesus all over the place. And while they were finding Jesus in the Old Testament, they also found Satan or the devil.