Plato, Laws 850a

περὶ συναλλάξεων. τὸ δὲ ὠνηθὲν ἢ πραθὲν ὅσῳ πλέον ἂν ᾖ καὶ πλέονος ἢ κατὰ τὸν νόμον, ὃς εἴρηκεν πόσου προσγενομένου καὶ ἀπογενομένου δεῖ μηδέτερα τούτων ποιεῖν, ἀναγραφήτω τότʼ ἤδη παρὰ τοῖς νομοφύλαξιν τὸ πλέον, ἐξαλειφέσθω δὲ τὸ ἐναντίον. τὰ αὐτὰ δὲ καὶ περὶ μετοίκων ἔστω τῆς ἀναγραφῆς πέρι τῆς οὐσίας. ἰέναι δὲ τὸν βουλόμενον εἰς τὴν μετοίκησιν ἐπὶ ῥητοῖς, ὡς οἰκήσεως οὔσης τῶν ξένων τῷ

And if the purchase or sale is greater or more costly than is allowed by the law stating the limits of increase or decrease of property beyond which both of these transactions are forbidden, the amount of difference must at once (in the case of excess) be registered with the Law-wardens, and (in the case of deficiency) be cancelled. The same rule shall hold good regarding the registration of property in the case of resident aliens. Whosoever wishes shall enter on residence as an alien on fixed terms, since residence is permitted to a foreigner who is willing and able to reside,