red book

/R EH1 D B UH0 K/
noun
  1. 1

    A book, often bound with a red cover, or online equivalent, that is an official, or canonical, collection of data, regulations, or writings.

    โ€œAll the chauntry preestis whos composicions are enrolled in the rede boke. T. Smith & L. T. Smith Eng. Gilds (1479, ed. 1870, p. 419, cited after OED)โ€

  2. 2

    A book supposedly belonging to the devil and containing the signatures of those in league with him.

Source: https://en.wiktionary.org/wiki/red%20book