oracle
divine pronouncement; its source
Today this word meansA god's word, or the place where it is given. Figuratively, an unquestioned authority.
Apollo's oracle at Delphi was the most authoritative seat of prophecy in the ancient Mediterranean.
But the word itself comes from Latin orare, "to speak" — from "speaking," not from any god's name.
Worth noting
The concept comes from Greek myth, but the etymology is Latin. Take care not to blur the two.