Plato, Laws 847c

πρὸς θεοὺς τὰ τοιαῦτα ἐστὶν ξενικὰ θυμιάματα, καὶ πορφύραν καὶ ὅσα βαπτὰ χρώματα, μὴ φερούσης τῆς χώρας, ἢ περί τινα ἄλλην τέχνην δεομένην ξενικῶν τινων εἰσαγωγίμων μηδενὸς ἀναγκαίου χάριν μήτε τις ἀγέτω, μήτε αὖ τῶν ἐν τῇ χώρᾳ ἀναγκαίων ἐμμένειν ἐξαγέτω· τούτων δʼ αὖ πάντων ἐπιγνώμονας εἶναι καὶ ἐπιμελητὰς τῶν νομοφυλάκων, πέντε ἀφαιρεθέντων τῶν πρεσβυτέρων, τοὺς ἑξῆς δώδεκα.

and purple and all dyes not produced in the country, and all pertaining to any other craft requiring foreign imported materials for a use that is not necessary, no one shall import; nor, on the other hand, shall he export any of the stuff which should of necessity remain in the country: and of all such matters the inspectors and supervisors shall consist of those twelve Law-wardens who remain next in order when five of the oldest are left out. In regard to arms and all instruments of war,