Book of Law
The Book of Law is the religious text used by the Cardinal Clerics and affiliated sects. The book is very old, and the religion is known to have existed since the Age of Darkness, and may have been practiced in Antiquity.
While the text is certainly sacred, actual copies are not. Worn volumes can be thrown out, and clerics will not be particularly offended if their books are burned or destroyed, though they may be miffed if a particular copy had sentimental value.