Plato, Laws 915d

χρημάτων, ἀναγέτω μὲν ὁ ἔχων εἰς πρατῆρα ἢ τὸν δόντα ἀξιόχρεών τε καὶ ἔνδικον ἤ τινι τρόπῳ παραδόντα ἄλλῳ κυρίως, εἰς μὲν πολίτην ἢ καὶ μέτοικον τῶν ἐν τῇ πόλει ἡμερῶν τριάκοντα, εἰς δὲ ξενικὴν παράδοσιν πέντε μηνῶν, ἧς μέσος ὁ μὴν ἐν ᾧ τρέπεται θερινὸς ἥλιος εἰς τὰ χειμερινά. ὅσα δὲ διά τινος ὠνῆς ἢ καὶ πράσεως ἀλλάττηταί τις ἕτερος ἄλλῳ, διδόντα ἐν χώρᾳ τῇ τεταγμένῃ ἑκάστοις κατʼ ἀγορὰν καὶ δεχόμενον ἐν τῷ παραχρῆμα τιμήν, οὕτως

of his chattels, the man who holds it shall refer the matter to the person who, as being its substantial and lawful owner, sold it, or gave it, or made it over to him in some other way; and this he shall do within thirty days, if the reference be made to a citizen or metic in the city, or, in the case of a foreign delivery, within three months, of which the middle month shall be at which includes the summer solstice. And when the man makes an exchange with another by an act buying or selling, the exchange shall be made by transfer of the article in the place appointed therefore in the market, and nowhere else, and by payment the price on the spot, and no purchase or sale shall be made