The Sibylline Books were a collection of oracular utterances, set out in Greek hexameter verses, that, according to tradition, were purchased from a sibyl by the last king of Rome, Lucius Tarquinius Superbus, and consulted at momentous crises through the history of the Roman Republic and the Empire.
Michelangelo's rendering of the Erythraean Sibyl
An oracle is a person or thing considered to provide insight, wise counsel or prophetic predictions, most notably including precognition of the future, inspired by deities. If done through occultic means, it is a form of divination.
The ruins of the Temple of Apollo at Didyma
Oracle bone of the Shang dynasty, ancient China