Ellen G. White, who the SDA Church upholds as divinely inspired and correcting of inaccurate interpretations of scripture, claimed that Adam was twice as tall as men today. She reiterates this same thing in Patriarchs and Prophets which she claimed was “barricaded by a thus saith the Lord.”
The Bible doesn’t say this. It is insight into how the SDA Church views Ellen White’s writings, though. 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.”