Clement of Alexandria, Miscellanies 22
Let the various accounts of the times, narrated by many and presented to us, stand as they are; but the writings — both the Law and the Prophetic books — they say were translated from the Hebrew dialect into the Greek language during the reign of King Ptolemy Lagus, or, as some hold, under the one surnamed Philadelphus, who devoted extraordinary zeal to the project, with Demetrius of Phalerum overseeing the translation work in detail. For while the Macedonians still held Asia, the king, eager to adorn the library he was building in Alexandria with every kind of writing, deemed it worthy to have the Jerusalemites render their prophecies into the Greek tongue (2 Maccabees 2:13).
Since they were still subject to the Macedonians, they chose seventy elders, men skilled in the Scriptures and versed in Greek, and sent them to him together with the sacred books. Each translated every prophecy separately, yet when all the versions were compared they matched in both thought and wording; for it was God's deliberate will that the message reach Greek ears (Deuteronomy 4:6).
It is therefore no wonder that, by the inspiration of the God who gave the prophecy, the translation itself functions as a kind of Greek prophecy; just as in the captivity under Nebuchadnezzar, when the writings had been destroyed in the time of Artaxerxes king of Persia, Ezra the Levite priest, moved by the Spirit, renewed all the ancient Scriptures by prophesying them anew (Ezra 7:10; Nehemiah 8:8).
Aristobulus, in the first of his books addressed to Philometor, writes word for word that Plato followed our legislation and clearly worked through each of its statements. Moreover, the account of the Hebrews' exodus from Egypt — our fellow citizens — and the manifestation and possession of all that befell them, together with the exposition of the whole Law, had been translated by others before Demetrius, before the rise of Alexander and the Persians; hence it is evident that the aforementioned philosopher borrowed much, having become widely learned, just as Pythagoras also transferred many elements from our tradition into his own system (Acts 7:22).
Numenius the Pythagorean philosopher states it outright: "What is Plato but Moses speaking Attic?" This Moses was a theologian and prophet, and, as some say, an interpreter of the sacred laws. The Scriptures themselves, trustworthy witnesses, proclaim his lineage, deeds, and life; yet we too must speak, as concisely as possible (John 5:46).
Greek
Καὶ τὰ μὲν περὶ τῶν χρόνων διαφόρως πολλοῖς ἱστορηθέντα καὶ πρὸς ἡμῶν ἐκτεθέντα ὧδε ἐχέτω, ἑρμηνευθῆναι δὲ τὰς γραφὰς τάς τε τοῦ νόμου καὶ τὰς προφητικὰς ἐκ τῆς τῶν Ἑβραίων διαλέκτου εἰς τὴν Ἑλλάδα γλῶττάν φασιν ἐπὶ βασιλέως Πτολεμαίου τοῦ Λάγου ἢ ὥς τινες ἐπὶ τοῦ Φιλαδέλφου ἐπικληθέντος, τὴν μεγίστην φιλοτιμίαν εἰς τοῦτο προσενεγκαμένου, Δημητρίου τοῦ Φαληρέως καὶ τὰ περὶ τὴν ἑρμηνείαν ἀκριβῶς πραγματευσαμένου· ἔτι γὰρ Μακεδόνων τὴν Ἀσίαν κατεχόντων φιλοτιμούμενος ὁ βασιλεὺς τὴν ἐν Ἀλεξανδρείᾳ πρὸς αὐτοῦ γενομένην βιβλιοθήκην πάσαις κατακοσμῆσαι γραφαῖς ἠξίωσε καὶ τοὺς Ἱεροσολυμίτας τὰς παρ’ αὐτοῖς προφητείας εἰς τὴν Ἑλλάδα διάλεκτον ἑρμηνεῦσαι. οἳ δὲ ἅτε ἔτι ὑπακούοντες Μακεδόσι τῶν παρὰ σφίσιν εὐδοκιμωτάτων περὶ τὰς γραφὰς ἐμπείρους καὶ τῆς Ἑλληνικῆς διαλέκτου εἰδήμονας ἑβδομήκοντα πρεσβυτέρους ἐκλεξάμενοι ἀπέστειλαν αὐτῷ μετὰ καὶ τῶν θείων βίβλων. ἑκάστου δὲ ἐν μέρει κατ’ ἰδίαν ἑκάστην ἑρμηνεύσαντος προφητείαν συνέπνευσαν αἱ πᾶσαι ἑρμηνεῖαι συναντιβληθεῖσαι καὶ τὰς διανοίας καὶ τὰς λέξεις· θεοῦ γὰρ ἦν βούλημα μεμελετημένον εἰς Ἑλληνικὰς ἀκοάς. οὐ δὴ ξένον ἐπιπνοίᾳ θεοῦ τοῦ τὴν προφητείαν δεδωκότος καὶ τὴν ἑρμηνείαν οἱονεὶ Ἑλληνικὴν προφητείαν ἐνεργεῖσθαι, ἐπεὶ κἀν τῇ ἐπὶ Ναβουχοδονόσορ αἰχμαλωσίᾳ διαφθαρεισῶν τῶν γραφῶν κατὰ τοὺς Ἀρταξέρξου τοῦ Περσῶν βασιλέως χρόνους ἐπίπνους Ἔσδρας ὁ Λευίτης ὁ ἱερεὺς γενόμενος πάσας τὰς παλαιὰς αὖθις ἀνανεούμενος προεφήτευσε γραφάς. Ἀριστόβουλος δὲ ἐν τῷ πρώτῳ τῶν πρὸς τὸν Φιλομήτορα κατὰ λέξιν γράφει· κατηκολούθηκε δὲ καὶ ὁ Πλάτων τῇ καθ’ ἡμᾶς νομοθεσίᾳ, καὶ φανερός ἐστι περιειργασμένος ἕκαστα τῶν ἐν αὐτῇ λεγομένων. διηρμήνευται δὲ πρὸ Δημητρίου ὑφ’ ἑτέρων, πρὸ τῆς Ἀλεξάνδρου καὶ Περσῶν ἐπικρατήσεως, τά τε κατὰ τὴν ἐξ Αἰγύπτου ἐξαγωγὴν τῶν Ἑβραίων τῶν ἡμετέρων πολιτῶν καὶ ἡ τῶν γεγονότων ἁπάντων αὐτοῖς ἐπιφάνεια καὶ κράτησις τῆς χώρας καὶ τῆς ὅλης νομοθεσίας ἐπεξήγησις· ὥστε εὔδηλον εἶναι τὸν προειρημένον φιλόσοφον εἰληφέναι πολλά (γέγονε γὰρ πολυμαθής), καθὼς καὶ Πυθαγόρας πολλὰ τῶν παρ’ ἡμῖν μετενέγκας εἰς τὴν ἑαυτοῦ δογματοποιίαν. Νουμήνιος δὲ ὁ Πυθαγόρειος φιλόσοφος ἄντικρυς γράφει· τί γάρ ἐστι Πλάτων ἢ Μωυσῆς ἀττικίζων; οὗτος ὁ Μωυσῆς θεολόγος καὶ προφήτης, ὡς δέ τινες νόμων ἱερῶν ἑρμηνεὺς ἦν. τὸ γένος αὐτοῦ καὶ τὰς πράξεις καὶ τὸν βίον ἀξιόπιστοι κηρύσσουσαι αὐταὶ αἱ γραφαί, λεκτέον δὲ ὅμως καὶ ἡμῖν ὡς ὅτι μάλιστα δἰ ὀλίγων.