Azhar Book - Dune

Appendix II: The Religion of Dune in the novel Dune refers to the Azhar Book as "that bibliographic marvel that preserves the great secrets of the most ancient faiths," and notes that it predates the Orange Catholic Bible, the key religious text of the Dune universe which "contains elements of most ancient religions.". The creation of the Azhar Book is also attributed to the Bene Gesserit.

The appendix subsequently quotes Paul "Muad'Dib" Atreides, and references his words back to ancient texts using the Azhar Book:

Muad'Dib: "Religion often partakes of the myth of progress that shields us from the terrors of an uncertain future."

C.E.T. Commentaries: Identical wording. (The Azhar Book traces this statement to the first century religious writer, Neshou; through a paraphrase.)

Muad'Dib: "If a child, an untrained person, an ignorant person, or an insane person incites trouble, it is the fault of authority for not predicting and preventing that trouble."

O.C. Bible: "Any sin can be ascribed, at least in part, to a natural bad tendency that is an extenuating circumstance acceptable to God." (The Azhar Book traces this to the ancient Semitic Tawra.)

Muad'Dib: "Reach forth thy hand and eat what God has provided thee; and when thou are replenished, praise the Lord."

O.C. Bible: a paraphrase with identical meaning. (The Azhar Book traces this in slightly different form to First Islam.)

In Dune, Lady Jessica examines the manual included in a Fremen desert survival kit on Arrakis:

The glowing tab of the Fremkit manual between them on the tent floor caught her eye. She lifted it, glanced at the flyleaf, reading: "Manual of 'The Friendly Desert,' the place full of life. Here are the ayat and burhan of Life. Believe, and al-Lat shall never burn you."
It reads like the Azhar Book, she thought, recalling her studies of the Great Secrets. Has a Manipulator of Religions been on Arrakis?

The Bene Gesserit practice "religious engineering" through a faction called the Missionaria Protectiva, which spreads contrived myths, prophecies and superstition on primitive worlds so that the Sisterhood may later exploit those regions. It is later confirmed that the Fremen religion has been thus influenced.