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The Scrolls of Kahless are ancient writings of importance to Klingon culture. The Klingon Laws of Honor are included in these writings. (TOS - Mere Anarchy eBook: The Blood-Dimmed Tide)
These are not to be confused with scrolls purported to be written by the historical Kahless (son of Kanjis), discovered on Qo'noS in 2371. (TNG novel: Kahless)