Legend has it that the oldest book in China
Sang fen w incarnation
Interpretation of Wen is said to be the earliest ancient book in China.
Source "Twelve Years of Zuo Zhao Zhuan Gong": "I can read three graves, five classics, eight lines and nine hills."
Structural joint idioms
For example, Lin Yutang's "Dongpo Gossip": "There may be records of the chronicles of bamboo books, or some of the Three Tombs and Five Classics."