Passage 5.13.2
ἔσοδος δὲ ἐς αὐτὸ πρὸς δυσμῶν ἐστιν ἡλίου. τοῦτο ἀπονεῖμαι τῷ Πέλοπι Ἡρακλῆς ὁ Ἀμφιτρύωνος λέγεται· τέταρτος γὰρ δὴ ἀπόγονος καὶ οὗτος ἦν Πέλοπος, λέγεται δὲ καὶ ὡς ἔθυσεν ἐς τὸν βόθρον τῷ Πέλοπι. θύουσι δὲ αὐτῷ καὶ νῦν ἔτι οἱ κατὰ ἔτος τὰς ἀρχὰς ἔχοντες· τὸ δὲ ἱερεῖόν ἐστι κριὸς μέλας. ἀπὸ ταύτης οὐ γίνεται τῷ μάντει μοῖρα τῆς θυσίας, τράχηλον δὲ μόνον δίδοσθαι τοῦ κριοῦ καθέστηκε τῷ ὀνομαζομένῳ ξυλεῖ.
The entrance to it is toward the setting of the sun. Heracles, son of Amphitryon, is said to have assigned this spot to Pelops; for he himself was descended from Pelops in the fourth generation. It is also related that he sacrificed to Pelops into the pit. Even now those who annually hold office offer sacrifice to Pelops, the sacrificial victim being a black ram. From this offering no portion is allotted to the seer; it is established custom to give only the neck of the ram to the one called the "woodman."