Plato, Meno 81a

οὐκοῦν καλῶς σοι δοκεῖ λέγεσθαι ὁ λόγος οὗτος, ὦ Σώκρατες; οὐκ ἔμοιγε. ἔχεις λέγειν ὅπῃ; ἔγωγε· ἀκήκοα γὰρ ἀνδρῶν τε καὶ γυναικῶν σοφῶν περὶ τὰ θεῖα πράγματα— τίνα λόγον λεγόντων; ἀληθῆ, ἔμοιγε δοκεῖν, καὶ καλόν. τίνα τοῦτον, καὶ τίνες οἱ λέγοντες; οἱ μὲν λέγοντές εἰσι τῶν ἱερέων τε καὶ τῶν ἱερειῶν ὅσοις μεμέληκε περὶ ὧν μεταχειρίζονται λόγον οἵοις τʼ εἶναι

Now does it seem to you to be a good argument, Socrates? It does not. Can you explain how not? I can; for I have heard from wise men and women who told of things divine that— What was it they said ? Something true, as I thought, and admirable. What was it? And who were the speakers? They were certain priests and priestesses who have studied so as to be able to give a reasoned account of their ministry; and Pindar also