Revelation 12:9 “And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him.”
That’s apocalyptic literature, which people interpret in a variety of ways, but it does mention Satan and describes him as a serpent, so it is not a complete leap.
Revelation 12:9 “And the great dragon was thrown down, that ancient serpent, who is called the devil and Satan, the deceiver of the whole world—he was thrown down to the earth, and his angels were thrown down with him.” That’s apocalyptic literature, which people interpret in a variety of ways, but it does mention Satan and describes him as a serpent, so it is not a complete leap.