Passage 3.15.3
Ἑλένης δὲ ἱερὰ καὶ Ἡρακλέους, τῆς μὲν πλησίον τοῦ τάφου τοῦ Ἀλκμᾶνος, τῷ δὲ ἐγγυτάτω τοῦ τείχους, ἐν αὐτῷ δὲ ἄγαλμα Ἡρακλέους ἐστὶν ὡπλισμένον· τὸ δὲ σχῆμα τοῦ ἀγάλματος διὰ τὴν πρὸς Ἱπποκόωντα καὶ τοὺς παῖδας μάχην γενέσθαι λέγουσι. τὸ δὲ ἔχθος Ἡρακλεῖ φασιν ἐς οἶκον ὑπάρξαι τὸν Ἱπποκόωντος, ὅτι μετὰ τὸν Ἰφίτου θάνατον καθαρσίων ἕνεκα ἐλθόντα αὐτὸν ἐν Σπάρτῃ ἀπηξίωσαν καθῆραι·
There are sanctuaries of Helen and of Heracles: the former is near the tomb of Alcman, and the latter very close to the city wall; inside it stands a statue of Heracles armed for battle. They say the particular posture of the statue commemorates the fight against Hippocoön and his sons. They also say Heracles harbored hostility toward the household of Hippocoön, because when he came to Sparta to be purified after the death of Iphitus, they refused him purification.