Ooh! Ooh! The Merenshtadt Text! I think the section on genocide has something about ascension.
―Willow Rosenberg[src]

The Merenshtadt Text was a book on the occult with a reference to the Ascension, specifically in the section on genocide. Rupert Giles kept a copy of the text in the Sunnydale High Library, among many volumes Giles wanted to keep away from Willow Rosenberg.