Καὶ ἄλλο τι περὶ Πυθαγόρου φησὶν ὁ Ἕρμιππος. λέγει γὰρ ὡς γενόμενος ἐν Ἰταλίᾳ κατὰ γῆς οἰκίσκον ποιήσαι καὶ τῇ μητρὶ ἐντείλαιτο τὰ γινόμενα εἰς δέλτον γράφειν σημειουμένην καὶ τὸν χρόνον, ἔπειτα καθιέναι αὐτῷ ἔστ’ ἂν ἀνέλθῃ. τοῦτο ποιῆσαι τὴν μητέρα. τὸν δὲ Πυθαγόραν μετὰ χρόνον ἀνελθεῖν ἰσχνὸν καὶ κατεσκελετευμένον· εἰσελθόντα τ’ εἰς τὴν ἐκκλησίαν φάσκειν ὡς ἀφῖκται ἐξ ᾅδου· καὶ δὴ καὶ ἀνεγίνωσκεν αὐτοῖς τὰ συμβεβηκότα. οἱ δὲ σαινόμενοι τοῖς λεγομένοις ἐδάκρυόν τε καὶ ᾤμωζον καὶ ἐπίστευον εἶναι τὸν Πυθαγόραν θεῖόν τινα, ὥστε καὶ τὰς γυναῖκας αὐτῷ παραδοῦναι, ὡς καὶ μαθησομένας τι τῶν αὐτοῦ· ἃς καὶ Πυθαγορικὰς κληθῆναι. καὶ ταῦτα μὲν ὁ Ἕρμιππος.
(Diogenes Laertius, Bioi kai Gnōmai 8.41)
Hermippus gives another anecdote. Pythagoras, on coming to Italy, made a subterranean dwelling and enjoined on his mother to mark and record all that passed, and at what hour, and to send her notes down to him until he should ascend. She did so. Pythagoras some time afterwards came up withered and looking like a skeleton, then went into the assembly and declared he had been down to Hades, and even read out his experiences to them. They were so affected that they wept and wailed and looked upon him as divine, going so far as to send their wives to him in hopes that they would learn some of his doctrines; and so they were called Pythagorean women. Thus far Hermippus. (tr. Robert Drew Hicks)