Passage 2.7.8
οἱ δὲ παῖδας ἑπτὰ καὶ ἴσας παρθένους ἐπὶ τὸν Σύθαν ποταμὸν ἀποστέλλουσιν ἱκετεύοντας· ὑπὸ τούτων δὲ πεισθέντας τοὺς θεούς φασιν ἐς τὴν τότε ἀκρόπολιν ἐλθεῖν, καὶ ὁ τόπος ἔνθα πρῶτον ἀφίκοντο Πειθοῦς ἐστιν ἱερόν. τούτοις δὲ ἐοικότα καὶ νῦν ἔτι ποιεῖται· καὶ γὰρ ἐπὶ τὸν Σύθαν ἴασιν οἱ παῖδες τῇ ἑορτῇ τοῦ Ἀπόλλωνος, καὶ ἀγαγόντες δὴ τοὺς θεοὺς ἐς τὸ τῆς Πειθοῦς ἱερὸν αὖθις ἀπάγειν ἐς τὸν ναόν φασι τοῦ Ἀπόλλωνος. ὁ δὲ ναὸς ἔστι μὲν ἐν τῇ νῦν ἀγορᾷ, τὸ δὲ ἐξ ἀρχῆς λέγουσιν αὐτὸν ὑπὸ Προίτου ποιηθῆναι· τὰς γάρ οἱ θυγατέρας ἐνταῦθα τῆς μανίας παύσασθαι.
They sent seven boys and an equal number of maidens as suppliants to the river Sythas. Persuaded by these suppliants, the gods, it is said, then came into the acropolis. The place where they first arrived is now a sanctuary of Peitho ("Persuasion"). Even today customs corresponding to these events still occur, for boys go to the river Sythas during the festival of Apollo, and after bringing the gods to the sanctuary of Peitho, they say they lead them back again to the temple of Apollo. This temple stands in what is now the market-place, and tradition holds that it was first built by Proetus, since it was here that his daughters were freed from their madness.