Passage 5.8.5
μετὰ δὲ Ὄξυλον---διέθηκε γὰρ τὸν ἀγῶνα καὶ Ὄξυλος---, μετὰ τοῦτον βασιλεύσαντα ἐξέλιπεν ἄχρι Ἰφίτου τὰ Ὀλύμπια. Ἰφίτου δὲ τὸν ἀγῶνα ἀνανεωσαμένου κατὰ τὰ ἤδη μοι λελεγμένα, τοῖς ἀνθρώποις ἔτι ὑπῆρχε τῶν ἀρχαίων λήθη· καὶ κατʼ ὀλίγον ἐς ὑπόμνησιν ἤρχοντο αὐτῶν, καὶ ὁπότε τι ἀναμνησθεῖεν, ἐποιοῦντο τῷ ἀγῶνι προσθήκην.
After Oxylus—for Oxylus had indeed settled the contest—the Olympic games died out following his reign until the time of Iphitus. But when Iphitus renewed the festival according to the manner that I have already described, men still remained forgetful of ancient customs; only gradually did they begin to recollect these traditions, and whenever they recalled something of the past, they added it to the contest.