Diogenes Laertius, Pythagoras 8.1
“Three books were composed by Pythagoras: Education, Politics, and Nature. But the one which is circulated as by him is really by Lysis of Tarentum, a Pythagorean, who was an exile in Thebes and a tutor to Epaminondas. Herakleides, the son of Sarapiôn, reports in his Epitome of Sotion that Pythagoras also wrote On Everything in epic verse, and, in addition, The Sacred Word which begins: “Young men, hold all these things in reverence with silence.”
Heracleides adds to this list third On the Soul, fourth, On Poetry, fifth, Helothales the Father of Epicharmus of Cos, sixth, Croton, and other works too. He also says that the Mystical Word was written by Hippasos to slander Pythagoras and that many works written by Aston of Kroton were misascribed to Pythagoras. Aristoxenos says that Pythagoras received most of his ethical beliefs from Themistokleia at Delphi.”
γέγραπται δὲ τῷ Πυθαγόρᾳ συγγράμματα τρία, Παιδευτικόν, Πολιτικόν, Φυσικόν· τὸ δὲ φερόμενον ὡς Πυθαγόρου Λύσιδός ἐστι τοῦ Ταραντίνου Πυθαγορικοῦ, φυγόντος εἰς Θήβας καὶ Ἐπαμεινώνδα καθηγησαμένου. φησὶ δ᾿ Ἡρακλείδης ὁ τοῦ Σαραπίωνος ἐν τῇ Σωτίωνος ἐπιτομῇ γεγραφέναι αὐτὸν καὶ Περὶ τοῦ ὅλου ἐν ἔπεσιν, δεύτερον τὸν Ἱερὸν λόγον, οὗ ἡ ἀρχή·
ὦ νέοι, ἀλλὰ σέβεσθε μεθ᾿ ἡσυχίης τάδε πάντα·
τρίτον Περὶ ψυχῆς, τέταρτον Περὶ εὐσεβείας, πέμπτον Ἡλοθαλῆ τὸν Ἐπιχάρμου τοῦ Κῴου πατέρα, ἕκτον Κρότωνα καὶ ἄλλους. τὸν δὲ Μυστικὸν λόγον Ἱππάσου φησὶν εἶναι, γεγραμμένον ἐπὶ διαβολῇ Πυθαγόρου, πολλοὺς δὲ καὶ ὑπὸ Ἄστωνος τοῦ Κροτωνιάτου γραφέντας ἀνατεθῆναι Πυθαγόρᾳ. φησὶ δὲ καὶ Ἀριστόξενος τὰ πλεῖστα τῶν ἠθικῶν δογμάτων λαβεῖν τὸν Πυθαγόραν παρὰ Θεμιστοκλείας τῆς ἐν Δελφοῖς.