Passage 5.7.10
Δία δὴ οἱ μὲν ἐνταῦθα παλαῖσαι καὶ αὐτῷ Κρόνῳ περὶ τῆς ἀρχῆς, οἱ δὲ ἐπὶ κατειργασμένῳ ἀγωνοθετῆσαί φασιν αὐτόν· νικῆσαι δὲ ἄλλοι τε λέγονται καὶ ὅτι Ἀπόλλων παραδράμοι μὲν ἐρίζοντα Ἑρμῆν, κρατήσαι δὲ Ἄρεως πυγμῇ. τούτου δὲ ἕνεκα καὶ τὸ αὔλημα τὸ Πυθικόν φασι τῷ πηδήματι ἐπεισαχθῆναι τῶν πεντάθλων, ὡς τὸ μὲν ἱερὸν τοῦ Ἀπόλλωνος τὸ αὔλημα ὄν, τὸν Ἀπόλλωνα δὲ ἀνῃρημένον Ὀλυμπικὰς νίκας.
Some say that it was here that Zeus wrestled with Cronus himself for sovereignty, but others say that Zeus established the games after he had already secured rule. Among those reputed as victors is Apollo, who is said to have defeated Hermes in a footrace and to have overcome Ares in boxing. For this reason, they say, the Pythian flute melody was introduced into the pentathlon during the long jump, as the flute melody was sacred to Apollo, who had himself won victories at Olympia.