The sibyls were prophetesses or oracles in Ancient Greece.
Statue in the Temple of Zeus at Aizanoi, believed to depict a sibyl.
Michelangelo's Delphic Sibyl, Sistine Chapel ceiling
Michelangelo's Libyan Sibyl, Sistine Chapel ceiling
Filippino Lippi, Five Sibyls Seated in Niches: the Samian, Cumean, Hellespontic, Phrygian and Tiburtine, ca. 1465-1470, Christ Church, Oxford.
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