A religious text or texts of unknown source and meaning. Vinny Doombats refers to it during a talk with Prince AnsomErf-b1-p068. Tramennis mentions a "Scorist" version of this, which is the belief that all your actions result in a change in an invisible stat called a "score". If you have a high enough score you're sent to where you belong in the afterlife, even if you don't believe in the Titans at all.
The scripture might be a hint that there are quite highly developed religious ideas in Erfworld. There have been a few other references to religion during the First Intermission, but with no introduction of actual texts.