Ellen G. White, who the SDA Church upholds as divinely inspired and correcting of inaccurate interpretations of scripture, claimed that, in the Garden of Eden, the Serpent had wings, and while flying through the air presented an appearance of dazzling brightness, having the color and brilliancy of burnished gold. She stated this in her book Patriarchs and Prophets which she claimed the words within are “barricaded by a thus saith the Lord.”
The Bible nowhere says this but this is precisely how the SDA Church views Ellen White’s writings—they are the “lesser light” that sheds extra details onto the “greater Light” (ie: the Bible) that aren’t actually found in the Bible.
This is what we call an “Advent-ism.”