Passage 10.12.5
τὴν δὲ Ἡροφίλην οἱ ἐν τῇ Ἀλεξανδρείᾳ ταύτῃ νεωκόρον τε τοῦ Ἀπόλλωνος γενέσθαι τοῦ Σμινθέως καὶ ἐπὶ τῷ ὀνείρατι τῷ Ἑκάβης χρῆσαί φασιν αὐτὴν ἃ δὴ καὶ ἐπιτελεσθέντα ἴσμεν. αὕτη ἡ Σίβυλλα ᾤκησε μὲν τὸ πολὺ τοῦ βίου ἐν Σάμῳ, ἀφίκετο δὲ καὶ ἐς Κλάρον τὴν Κολοφωνίων καὶ ἐς Δῆλόν τε καὶ ἐς Δελφούς· ὁπότε δὲ ἀφίκοιτο, ἐπὶ ταύτης ἱσταμένη τῆς πέτρας ᾖδε.
The people of Alexandria say that this Herophile became attendant of Apollo Smintheus, and that she prophesied regarding the dream of Hecuba; we know these things were fulfilled. This Sibyl spent most of her life on Samos, but came also to Clarus in the land of the Colophonians, as well as to Delos and Delphi. Whenever she arrived at Delphi, she would stand upon this very rock and sing her prophecies.